Fix resource identifier in "loadedFromMemoryCache" notifications.

willSendRequest invoked from ResourceFetcher.notifyLoadedFromMemoryCache
sends Inspector old identifier.

BUG=292441

Review URL: https://chromiumcodereview.appspot.com/23578036

git-svn-id: svn://svn.chromium.org/blink/trunk@157909 bbb929c8-8fbe-4397-9dbb-9b2b20218538