input: Make the OverscrollController less intrusive, and some code cleanup.

content/browser/renderer_host/overscroll_controller.h

Index: content/browser/renderer_host/overscroll_controller.h
diff --git a/content/browser/renderer_host/overscroll_controller.h b/content/browser/renderer_host/overscroll_controller.h
index 9c8282ed60a1e55b3d8c897cfa174a36388d6f28..fab531947ee045165df45595c8f1c829fdc19cf0 100644
--- a/content/browser/renderer_host/overscroll_controller.h
+++ b/content/browser/renderer_host/overscroll_controller.h
@@ -89,8 +89,9 @@ class OverscrollController {
   // overscroll gesture status.
   bool DispatchEventResetsState(const WebKit::WebInputEvent& event) const;
 
-  // Processes an event and updates internal state for overscroll.
-  void ProcessEventForOverscroll(const WebKit::WebInputEvent& event);
+  // Processes an event to update the internal state for overscroll. Returns
+  // true if the state is updated, false otherwise.
+  bool ProcessEventForOverscroll(const WebKit::WebInputEvent& event);
 
   // Processes horizontal overscroll. This can update both the overscroll mode
   // and the over scroll amount (i.e. |overscroll_mode_|, |overscroll_delta_x_|
@@ -106,10 +107,6 @@ class OverscrollController {
   // appropriate).
   void SetOverscrollMode(OverscrollMode new_mode);
 
-  // Returns whether the input event should be forwarded to the
-  // RenderWidgetHost.
-  bool ShouldForwardToHost(const WebKit::WebInputEvent& event) const;
-
   // The RenderWidgetHost that owns this overscroll controller.
   RenderWidgetHostImpl* render_widget_host_;