Rename NoEventDispatchAssertion to EventDispatchForbiddenScope and move it to platform/

Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 20 matching lines @@
       'DateComponents.cpp',
       'DateComponents.h',
       'DateTimeChooser.cpp',
       'DateTimeChooser.h',
       'DateTimeChooserClient.cpp',
       'DateTimeChooserClient.h',
       'Decimal.cpp',
       'Decimal.h',
       'DragImage.cpp',
       'DragImage.h',
+      'EventDispatchForbiddenScope.h',
       'EventTracer.cpp',
       'EventTracer.h',
       'FileChooser.cpp',
       'FileChooser.h',
       'FileMetadata.cpp',
       'FileMetadata.h',
       'FileSystemType.h',
       'FloatConversion.h',
       'HostWindow.h',
       'JSONValues.cpp',
@@ skipping 909 matching lines @@
       'graphics/ImageLayerChromiumTest.cpp',
       'graphics/OpaqueRectTrackingContentLayerDelegateTest.cpp',
       'graphics/test/MockImageDecoder.h',
       'graphics/test/MockWebGraphicsContext3D.h',
       'image-decoders/gif/GIFImageDecoderTest.cpp',
       'image-decoders/jpeg/JPEGImageDecoderTest.cpp',
       'image-decoders/webp/WEBPImageDecoderTest.cpp',
     ],
   },
 }