Fix Android tab navigation "stretch" regression.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 209 matching lines @@
   bool OnTouchEvent(const ui::MotionEvent& event);
   bool OnTouchHandleEvent(const ui::MotionEvent& event);
   void ResetGestureDetection();
   void SetDoubleTapSupportEnabled(bool enabled);
   void SetMultiTouchZoomSupportEnabled(bool enabled);
 
   long GetNativeImeAdapter();
 
   void WasResized();
 
-  void GetScaledContentBitmap(float scale,
-                              SkColorType preferred_color_type,
-                              gfx::Rect src_subrect,
-                              const ReadbackRequestCallback& result_callback);
-
   bool HasValidFrame() const;
 
   void MoveCaret(const gfx::Point& point);
   void DismissTextHandles();
   void SetTextHandlesTemporarilyHidden(bool hidden);
   void OnShowUnhandledTapUIIfNeeded(int x_dip, int y_dip);
 
   void SynchronousFrameMetadata(cc::CompositorFrameMetadata frame_metadata);
 
   void SetSynchronousCompositorClient(SynchronousCompositorClient* client);
@@ skipping 153 matching lines @@
   float prev_bottom_shown_pix_;
 
   base::WeakPtrFactory<RenderWidgetHostViewAndroid> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_