Remove PlatformMouseEvent and use WebMouseEvent instead

third_party/WebKit/public/platform/WebInputEvent.h

Index: third_party/WebKit/public/platform/WebInputEvent.h
diff --git a/third_party/WebKit/public/platform/WebInputEvent.h b/third_party/WebKit/public/platform/WebInputEvent.h
index 99e27f0810b4b9658680d37301fec4a7d3d6d8b9..9efd6a8781a37618f4d8440c758969acdf47b87f 100644
--- a/third_party/WebKit/public/platform/WebInputEvent.h
+++ b/third_party/WebKit/public/platform/WebInputEvent.h
@@ -187,6 +187,11 @@ class WebInputEvent {
 
     ScrollLockOn = 1 << 18,
 
+    // Whether this is a compatibility event generated due to a
+    // native touch event. Mouse events generated from touch
+    // events will set this.
+    IsCompatibilityEventForTouch = 1 << 19,
+
     // The set of non-stateful modifiers that specifically change the
     // interpretation of the key being pressed. For example; IsLeft,
     // IsRight, IsComposing don't change the meaning of the key