ui: Make gfx::Size::Scale() mutate the class. Add gfx::ScaleSize() similar to Rect/Point.

ui/gfx/size.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_SIZE_H_
 #define UI_GFX_SIZE_H_
 
 #include <string>
 
 #include "build/build_config.h"
@@ skipping 29 matching lines @@
 #if defined(OS_WIN)
   SIZE ToSIZE() const;
 #elif defined(OS_MACOSX)
   CGSize ToCGSize() const;
 #endif
 
   operator SizeF() const {
     return SizeF(width(), height());
   }
 
-  SizeF Scale(float scale) const WARN_UNUSED_RESULT {
-    return Scale(scale, scale);
-  }
-
-  SizeF Scale(float x_scale, float y_scale) const WARN_UNUSED_RESULT {
-    return SizeF(width() * x_scale, height() * y_scale);
-  }
-
   std::string ToString() const;
 };
 
 inline bool operator==(const Size& lhs, const Size& rhs) {
   return lhs.width() == rhs.width() && lhs.height() == rhs.height();
 }
 
 inline bool operator!=(const Size& lhs, const Size& rhs) {
   return !(lhs == rhs);
 }
 
 #if !defined(COMPILER_MSVC)
 extern template class SizeBase<Size, int>;
 #endif
 
 }  // namespace gfx
 
 #endif  // UI_GFX_SIZE_H_