Remove final RenderWidgetHostImpl dependency from OverscrollController

content/browser/renderer_host/overscroll_controller.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
 namespace ui {
 struct LatencyInfo;
 }
 
 namespace content {
 
 class MockRenderWidgetHost;
 class OverscrollControllerDelegate;
-class RenderWidgetHostImpl;
 
 // Indicates the direction that the scroll is heading in relative to the screen,
 // with the top being NORTH.
 enum OverscrollMode {
   OVERSCROLL_NONE,
   OVERSCROLL_NORTH,
   OVERSCROLL_SOUTH,
   OVERSCROLL_WEST,
   OVERSCROLL_EAST,
   OVERSCROLL_COUNT
 };
 
 // When a page is scrolled beyond the scrollable region, it will trigger an
 // overscroll gesture. This controller receives the events that are dispatched
 // to the renderer, and the ACKs of events, and updates the overscroll gesture
 // status accordingly.
 class OverscrollController {
  public:
-  // Creates an overscroll controller for the specified RenderWidgetHost.
-  // The RenderWidgetHost owns this overscroll controller.
-  // TODO(jdduke): crbug.com/306194 - Take an OverscrollControllerClient.
-  explicit OverscrollController(RenderWidgetHostImpl* widget_host);
+  OverscrollController();
   virtual ~OverscrollController();
 
   // The result of |DispatchEvent()|, indicating either how the event was
   // handled, or how it should be handled by the caller.
   enum Disposition {
     CONSUMED,
     SHOULD_FORWARD_TO_RENDERER,
     SHOULD_FORWARD_TO_GESTURE_FILTER
   };
   // This must be called when dispatching any event from the
@@ skipping 54 matching lines @@
                          float delta_y,
                          WebKit::WebInputEvent::Type event_type);
 
   // Completes the desired action from the current gesture.
   void CompleteAction();
 
   // Sets the overscroll mode (and triggers callback in the delegate when
   // appropriate).
   void SetOverscrollMode(OverscrollMode new_mode);
 
-  // The RenderWidgetHost that owns this overscroll controller.
-  RenderWidgetHostImpl* render_widget_host_;
-
   // The current state of overscroll gesture.
   OverscrollMode overscroll_mode_;
 
   // Used to keep track of the scrolling state.
   // If scrolling starts, and some scroll events are consumed at the beginning
   // of the scroll (i.e. some content on the web-page was scrolled), then do not
   // process any of the subsequent scroll events for generating overscroll
   // gestures.
   ScrollState scroll_state_;
 
   // The amount of overscroll in progress. These values are invalid when
   // |overscroll_mode_| is set to OVERSCROLL_NONE.
   float overscroll_delta_x_;
   float overscroll_delta_y_;
 
   // The delegate that receives the overscroll updates. The delegate is not
   // owned by this controller.
   OverscrollControllerDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(OverscrollController);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_OVERSCROLL_CONTROLLER_H_