Repository: flutter
Issue: [macos] Crash when requesting speech permission when running from VS Code 
Labels: engine,platform-mac,a: desktop,has reproducible steps,P2,c: fatal crash,found in release: 3.3,found in release: 3.7,team-tool,triaged-tool

I had a crash issue when run on mac app. This issue happended 100% on debug & release mode
This is the [minimal test project](https://www.dropbox.com/s/w59b0nbh42i6mw7/speech_test.zip?dl=0) 
I just create a project with `flutter create speech_test` and setup platform channel.
The issue happens in mac os platform channel when I asking speech permission on this line:
```
SFSpeechRecognizer.requestAuthorization()
```

<details>
  <summary>Logs</summary>


**flutter run --v**

```
{"CFBundleName":"speech_test","DTXcode":"1210","DTSDKName":"macosx10.15","NSHumanReadableCopyright":"Copyright © 2020
com.example. All rights
reserved.","DTSDKBuild":"19G68","CFBundleDevelopmentRegion":"en","CFBundleVersion":"1","BuildMachineOSBuild":"19H2","NS
PrincipalClass":"NSApplication","CFBundleIconName":"AppIcon","CFBundlePackageType":"APPL","CFBundleIconFile":"AppIcon",
"CFBundleSupportedPlatforms":["MacOSX"],"DTPlatformName":"macosx","CFBundleShortVersionString":"1.0.0","NSMainNibFile":
"MainMenu","CFBundleInfoDictionaryVersion":"6.0","CFBundleExecutable":"speech_test","DTCompiler":"com.apple.compilers.l
lvm.clang.1_0","CFBundleIdentifier":"com.example.speechTest","DTPlatformVersion":"10.15.6","DTXcodeBuild":"12A7403","LS
MinimumSystemVersion":"10.15","DTPlatformBuild":"12A7403","NSSpeechRecognitionUsageDescription":"App needs to access
speech"}
[+3280 ms] Observatory URL on device: http://127.0.0.1:52507/akuZ6vCfY4w=/
[   +9 ms] Caching compiled dill
[ +155 ms] Connecting to service protocol: http://127.0.0.1:52507/akuZ6vCfY4w=/
[   +2 ms] Launching a Dart Developer Service (DDS) instance at http://127.0.0.1:0, connecting to VM service at
http://127.0.0.1:52507/akuZ6vCfY4w=/.
[ +300 ms] DDS is listening at http://127.0.0.1:52509/29R3AcOpmrs=/.
[ +110 ms] Successfully connected to service protocol: http://127.0.0.1:52507/akuZ6vCfY4w=/
[        ] Waiting for macOS to report its views...
[   +8 ms] Waiting for macOS to report its views... (completed in 7ms)
[  +14 ms] DevFS: Creating new filesystem on the device (null)
[  +21 ms] DevFS: Created new filesystem on the device
(file:///var/folders/11/wq1vn8yd2739xsmmzbq3m06w0000gn/T/com.example.speechTest/speech_testyBCWdV/speech_test/)
[   +2 ms] Updating assets
[ +115 ms] Syncing files to device macOS...
[   +2 ms] <- reset
[        ] Compiling dart to kernel with 0 updated files
[   +3 ms] <- recompile package:speech_test/main.dart 74867277-0531-4bf0-9ce9-1b8ac3ec4b54
[        ] <- 74867277-0531-4bf0-9ce9-1b8ac3ec4b54
[ +137 ms] Updating files.
[        ] DevFS: Sync finished
[        ] Syncing files to device macOS... (completed in 144ms)
[        ] Synced 0.0MB.
[   +1 ms] <- accept
[   +7 ms] Connected to _flutterView/0x7f9ec107d820.
[   +2 ms] Flutter run key commands.
[   +2 ms] r Hot reload. 🔥🔥🔥
[   +1 ms] R Hot restart.
[        ] h Repeat this help message.
[        ] d Detach (terminate "flutter run" but leave application running).
[        ] c Clear the screen
[        ] q Quit (terminate the application on the device).
[        ] An Observatory debugger and profiler on macOS is available at: http://127.0.0.1:52509/29R3AcOpmrs=/
[+8221 ms] Service protocol connection closed.
[        ] Lost connection to device.
[   +3 ms] DevFS: Deleting filesystem on the device
(file:///var/folders/11/wq1vn8yd2739xsmmzbq3m06w0000gn/T/com.example.speechTest/speech_testyBCWdV/speech_test/)
[ +259 ms] Ignored error while cleaning up DevFS: TimeoutException after 0:00:00.250000: Future not completed
[   +3 ms] "flutter run" took 50,296ms.
[ +236 ms] ensureAnalyticsSent: 226ms
[   +1 ms] Running shutdown hooks
[        ] Shutdown hook priority 4
[   +6 ms] Shutdown hooks complete
[        ] exiting with code 0
```

**flutter doctor -v**

```
[✓] Flutter (Channel master, 1.24.0-8.0.pre.194, on Mac OS X 10.15.7 19H2 darwin-x64, locale en-US)
    • Flutter version 1.24.0-8.0.pre.194 at /Users/ductran/Documents/Soft/flutter
    • Framework revision 018467cdb1 (24 hours ago), 2020-11-11 02:04:03 -0500
    • Engine revision 81f219c59c
    • Dart version 2.12.0 (build 2.12.0-31.0.dev)

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at /Users/ductran/Library/Android/sdk
    • Platform android-30, build-tools 30.0.2
    • ANDROID_HOME = /Users/ductran/Library/Android/sdk
    • ANDROID_SDK_ROOT = /Users/ductran/Library/Android/sdk
    • Java binary at: /Applications/Android Studio 3.5 Preview.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 12.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.1, Build version 12A7403
    • CocoaPods version 1.9.3

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio 3.5 Preview.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.51.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.16.0

[✓] Connected device (3 available)
    • macOS (desktop)  • macos      • darwin-x64     • Mac OS X 10.15.7 19H2 darwin-x64
    • Web Server (web) • web-server • web-javascript • Flutter Tools
    • Chrome (web)     • chrome     • web-javascript • Google Chrome 86.0.4240.193

• No issues found!
```

</details>