Move compositor InputHandler from RenderViewImpl to RenderWidget.

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index c2435b92749f4d355cdfddab4a268706c49d296e..35cef5163650fbaa356bd3a87c4bace6c284ea84 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -18,7 +18,6 @@
 #include "base/gtest_prod_util.h"
 #include "base/id_map.h"
 #include "base/macros.h"
-#include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
@@ -126,8 +125,7 @@ class CONTENT_EXPORT RenderViewImpl
     : public RenderWidget,
       NON_EXPORTED_BASE(public blink::WebViewClient),
       public RenderWidgetOwnerDelegate,
-      public RenderView,
-      public base::SupportsWeakPtr<RenderViewImpl> {
+      public RenderView {
  public:
   // Creates a new RenderView. |opener_id| is the routing ID of the RenderView
   // responsible for creating this RenderView. Note that if the original opener
@@ -216,7 +214,7 @@ class CONTENT_EXPORT RenderViewImpl
   void AttachWebFrameWidget(blink::WebFrameWidget* frame_widget);
 
   void TransferActiveWheelFlingAnimation(
-      const blink::WebActiveWheelFlingParameters& params);
+      const blink::WebActiveWheelFlingParameters& params) override;
 
   // Starts a timer to send an UpdateState message on behalf of |frame|, if the
   // timer isn't already running. This allows multiple state changing events to
@@ -614,7 +612,7 @@ class CONTENT_EXPORT RenderViewImpl
   // Launch an Android content intent with the given URL.
   void LaunchAndroidContentIntent(const GURL& intent_url,
                                   size_t request_id,
-                                  bool is_main_frame);
+                                  bool is_main_frame) override;
 #endif
 
 #if defined(OS_WIN) || (defined(OS_POSIX) && !defined(OS_MACOSX))
@@ -865,8 +863,6 @@ class CONTENT_EXPORT RenderViewImpl
   typedef std::map<cc::SharedBitmapId, cc::SharedBitmap*> BitmapMap;
   BitmapMap disambiguation_bitmaps_;
 
-  bool has_added_input_handler_;
-
   // ---------------------------------------------------------------------------
   // ADDING NEW DATA? Please see if it fits appropriately in one of the above
   // sections rather than throwing it randomly at the end. If you're adding a