Remove dependency on ui::ScaleFactor from ui/gfx

ui/gfx/image/canvas_image_source.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 UI_GFX_IMAGE_CANVAS_IMAGE_SOURCE_H_
 #define UI_GFX_IMAGE_CANVAS_IMAGE_SOURCE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/gfx/gfx_export.h"
@@ skipping 12 matching lines @@
  public:
   CanvasImageSource(const gfx::Size& size, bool is_opaque);
 
   // Called when a new image needs to be drawn for a scale factor.
   virtual void Draw(gfx::Canvas* canvas) = 0;
 
   // Returns the size of images in DIP that this source will generate.
   const gfx::Size& size() const { return size_; };
 
   // Overridden from gfx::ImageSkiaSource.
-  virtual gfx::ImageSkiaRep GetImageForScale(
-      ui::ScaleFactor scale_factor) OVERRIDE;
+  virtual gfx::ImageSkiaRep GetImageForScale(float scale) OVERRIDE;
 
  protected:
   virtual ~CanvasImageSource() {}
 
   const gfx::Size size_;
   const bool is_opaque_;
   DISALLOW_COPY_AND_ASSIGN(CanvasImageSource);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_IMAGE_CANVAS_IMAGE_SOURCE_H_