blink: Cleanup class/struct forward declarations

third_party/WebKit/public/platform/Platform.h

Index: third_party/WebKit/public/platform/Platform.h
diff --git a/third_party/WebKit/public/platform/Platform.h b/third_party/WebKit/public/platform/Platform.h
index e8e786ffcf145627955cdb4bc791ca4cebfaca5c..4264a4cd22d5e6a7a3757f12025b6c572370b9dc 100644
--- a/third_party/WebKit/public/platform/Platform.h
+++ b/third_party/WebKit/public/platform/Platform.h
@@ -57,8 +57,6 @@
 #include "cc/resources/shared_bitmap.h"
 #include "cc/surfaces/frame_sink_id.h"
 
-class GrContext;
-
 namespace gpu {
 class GpuMemoryBufferManager;
 }
@@ -89,7 +87,6 @@ class WebGestureCurve;
 class WebGraphicsContext3DProvider;
 class WebIDBFactory;
 class WebImageCaptureFrameGrabber;
-class WebInstalledApp;
 class WebMIDIAccessor;
 class WebMIDIAccessorClient;
 class WebMediaPlayer;
@@ -102,7 +99,6 @@ class WebMessagePortChannel;
 class WebNotificationManager;
 class WebPluginListBuilder;
 class WebPrescientNetworking;
-class WebProcessMemoryDump;
 class WebPublicSuffixList;
 class WebPushProvider;
 class WebRTCCertificateGenerator;