touch: Cleanup touch-event mode switching on windows.

content/browser/renderer_host/render_widget_host_view_win.h

Index: content/browser/renderer_host/render_widget_host_view_win.h
diff --git a/content/browser/renderer_host/render_widget_host_view_win.h b/content/browser/renderer_host/render_widget_host_view_win.h
index 034a9bb1b380b378fafbbdbc197a58b88b609985..79536bcac9fa7f8e88eddbdd9df71bed08cf6959 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.h
+++ b/content/browser/renderer_host/render_widget_host_view_win.h
@@ -201,8 +201,7 @@ class RenderWidgetHostViewWin
       const base::Callback<void(bool)>& callback,
       skia::PlatformCanvas* output) OVERRIDE;
   virtual void OnAcceleratedCompositingStateChange() OVERRIDE;
-  virtual void ProcessTouchAck(WebKit::WebInputEvent::Type type,
-                               bool processed) OVERRIDE;
+  virtual void ProcessTouchAck(bool processed) OVERRIDE;
   virtual void SetHasHorizontalScrollbar(
       bool has_horizontal_scrollbar) OVERRIDE;
   virtual void SetScrollOffsetPinning(
@@ -407,9 +406,9 @@ class RenderWidgetHostViewWin
   // a WM_POINTERDOWN message.
   void ResetPointerDownContext();
 
-  // Switches between raw-touches mode and gesture mode. Currently touch mode
-  // will only take effect when kEnableTouchEvents is in effect.
-  void UpdateDesiredTouchMode(bool touch);
+  // Sets the appropriate mode for raw-touches or gestures. Currently touch mode
+  // will only take effect when kEnableTouchEvents is in effect (on Win7+).
+  void UpdateDesiredTouchMode();
 
   // Set window to receive gestures.
   void SetToGestureMode();