Remove obsolete pinch-zoom related code.

public/web/WebView.h

 /*
  * Copyright (C) 2009, 2010, 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 212 matching lines @@
     // is scaled up, < 1.0 is scaled down.
     virtual float pageScaleFactor() const = 0;
 
     // TODO: Obsolete, the origin parameter is ambiguous with two viewports. Remove
     // once Chromium side users are removed.
     // Scales a page by a factor of scaleFactor and then sets a scroll position to (x, y).
     // setPageScaleFactor() magnifies and shrinks a page without affecting layout.
     // On the other hand, zooming affects layout of the page.
     virtual void setPageScaleFactor(float scaleFactor, const WebPoint& origin) { setPageScaleFactor(scaleFactor); }
 
-    // TODO: Reevaluate if this is needed once all users are converted to using the
-    // virtual viewport pinch model.
-    // Temporary to keep old style pinch viewport working while we gradually bring up
-    // virtual viewport pinch.
-    virtual void setMainFrameScrollOffset(const WebPoint& origin) = 0;
-
     // Scales the page without affecting layout by using the pinch-to-zoom viewport.
     virtual void setPageScaleFactor(float) = 0;
 
     // Sets the offset of the pinch-to-zoom viewport within the main frame, in
     // partial CSS pixels. The offset will be clamped so the pinch viewport
     // stays within the frame's bounds.
     virtual void setPinchViewportOffset(const WebFloatPoint&) = 0;
 
     // Gets the pinch viewport's current offset within the page's main frame,
     // in partial CSS pixels.
@@ skipping 225 matching lines @@
     // context's ability to deal with that failure gracefully can be tested.
     virtual void forceNextDrawingBufferCreationToFail() = 0;
 
 protected:
     ~WebView() {}
 };
 
 } // namespace blink
 
 #endif