Remove unused function Compositor::setDeviceScaleFactor.

content/public/browser/android/compositor.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_PUBLIC_BROWSER_ANDROID_COMPOSITOR_H_
 #define CONTENT_PUBLIC_BROWSER_ANDROID_COMPOSITOR_H_
 
 #include "base/callback.h"
 #include "cc/resources/ui_resource_bitmap.h"
 #include "content/common/content_export.h"
@@ skipping 24 matching lines @@
   static void Initialize();
 
   // Creates and returns a compositor instance.  |root_window| needs to outlive
   // the compositor as it manages callbacks on the compositor.
   static Compositor* Create(CompositorClient* client,
                             gfx::NativeWindow root_window);
 
   // Attaches the layer tree.
   virtual void SetRootLayer(scoped_refptr<cc::Layer> root) = 0;
 
-  // Set the scale factor from DIP to pixel.
-  virtual void setDeviceScaleFactor(float factor) = 0;
-
   // Set the output surface bounds.
   virtual void SetWindowBounds(const gfx::Size& size) = 0;
 
   // Set the output surface which the compositor renders into.
   virtual void SetSurface(jobject surface) = 0;
 
   // Tells the view tree to assume a transparent background when rendering.
   virtual void SetHasTransparentBackground(bool flag) = 0;
 
   // Request layout and draw. You only need to call this if you need to trigger
   // Composite *without* having modified the layer tree.
   virtual void SetNeedsComposite() = 0;
 
   // Returns the UI resource provider associated with the compositor.
   virtual ui::UIResourceProvider& GetUIResourceProvider() = 0;
 
   // Returns the resource manager associated with the compositor.
   virtual ui::ResourceManager& GetResourceManager() = 0;
 
  protected:
   Compositor() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_ANDROID_COMPOSITOR_H_