Scroll offset pinning and content size notifications were only used for the Mac overlay navigation …

content/browser/renderer_host/render_widget_host_view_base.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_BASE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_
 
 #if defined(OS_MACOSX)
 #include <OpenGL/OpenGL.h>
 #endif
@@ skipping 298 matching lines @@
   // returned only if the accelerated surface size matches.
   virtual bool HasAcceleratedSurface(const gfx::Size& desired_size) = 0;
 
   virtual void GetScreenInfo(blink::WebScreenInfo* results) = 0;
 
   // Gets the bounds of the window, in screen coordinates.
   virtual gfx::Rect GetBoundsInRootWindow() = 0;
 
   virtual gfx::GLSurfaceHandle GetCompositingSurface() = 0;
 
-  virtual void SetScrollOffsetPinning(
-      bool is_pinned_to_left, bool is_pinned_to_right) = 0;
-
 #if defined(OS_ANDROID)
   virtual void ShowDisambiguationPopup(const gfx::Rect& target_rect,
                                        const SkBitmap& zoomed_bitmap) = 0;
 
   // Instructs the view to not drop the surface even when the view is hidden.
   virtual void LockCompositingSurface() = 0;
   virtual void UnlockCompositingSurface() = 0;
 #endif
 
 #if defined(OS_MACOSX)
@@ skipping 93 matching lines @@
   uint32 renderer_frame_number_;
 
   base::OneShotTimer<RenderWidgetHostViewBase> flush_input_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewBase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_BASE_H_