GYP: Merge svg_idl_files list into core_idl_files

Minor simplification: there is no need for two separate lists:
SVG files handled the same for the build.

Review URL: https://codereview.chromium.org/135653004

git-svn-id: svn://svn.chromium.org/blink/trunk@165197 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Web MIDI: implement strict message validation

- Support Real-Time Messages.
- Allow system messages without SysEx permission.
- Strict SysEx check.
- Introduce SyntaxError against invalid messages.
- Show useful information as a part of errors.

BUG=331859

Review URL: https://codereview.chromium.org/131823002

git-svn-id: svn://svn.chromium.org/blink/trunk@165198 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Use the VTTCue constructor instead of TextTrackCue in test

The TextTrackCue constructor is being deprecated.

BUG=334942

Review URL: https://codereview.chromium.org/140563002

git-svn-id: svn://svn.chromium.org/blink/trunk@165199 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Revert 165068 "Ensure ElementData exists before modifying when a..."

Caused UAFs on ClusterFuzz.

> Ensure ElementData exists before modifying when animating class attribute
> 
> This is a merge of http://trac.webkit.org/changeset/153835
> by Rob Buis <rwlbuis@webkit.org>.
> 
> BUG=334194
> 
> Review URL: https://codereview.chromium.org/138173002

TBR=fs@opera.com

Review URL: https://codereview.chromium.org/130843006

git-svn-id: svn://svn.chromium.org/blink/trunk@165200 bbb929c8-8fbe-4397-9dbb-9b2b20218538