[Android] Speculative fix for crash during overscroll effect creation

content/browser/renderer_host/render_widget_host_view_android.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_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 
 #include <map>
 #include <queue>
 
@@ skipping 181 matching lines @@
                                                   size_t end_offset) OVERRIDE;
 
   // cc::DelegatedFrameResourceCollectionClient implementation.
   virtual void UnusedResourcesAreAvailable() OVERRIDE;
 
   // ui::GestureProviderClient implementation.
   virtual void OnGestureEvent(const ui::GestureEventData& gesture) OVERRIDE;
 
   // ui::WindowAndroidObserver implementation.
   virtual void OnCompositingDidCommit() OVERRIDE;
-  virtual void OnAttachCompositor() OVERRIDE {}
+  virtual void OnAttachCompositor() OVERRIDE;
   virtual void OnDetachCompositor() OVERRIDE;
   virtual void OnVSync(base::TimeTicks frame_time,
                        base::TimeDelta vsync_period) OVERRIDE;
   virtual void OnAnimate(base::TimeTicks begin_frame_time) OVERRIDE;
 
   // ImageTransportFactoryAndroidObserver implementation.
   virtual void OnLostResources() OVERRIDE;
 
   // DelegatedFrameEvictor implementation
   virtual void EvictDelegatedFrame() OVERRIDE;
@@ skipping 214 matching lines @@
 
   // List of readbackrequests waiting for arrival of a valid frame.
   std::queue<ReadbackRequest> readbacks_waiting_for_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_