Get rid of implicit conversion to and from ImageSkiaRep

ui/gfx/image/image_skia_rep.cc

 // 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.
 
 #include "ui/gfx/image/image_skia_rep.h"
 
 #include "ui/gfx/size.h"
 
 namespace gfx {
 
 ImageSkiaRep::ImageSkiaRep()
     : scale_factor_(ui::SCALE_FACTOR_NONE) {
 }
 
 ImageSkiaRep::~ImageSkiaRep() {
 }
 
 ImageSkiaRep::ImageSkiaRep(const gfx::Size& size,
                            ui::ScaleFactor scale_factor)
     : scale_factor_(scale_factor) {
   float scale = ui::GetScaleFactorScale(scale_factor);
   bitmap_.setConfig(SkBitmap::kARGB_8888_Config,
                     static_cast<int>(size.width() * scale),
                     static_cast<int>(size.height() * scale));
   bitmap_.allocPixels();
 }
 
-ImageSkiaRep::ImageSkiaRep(const SkBitmap& src)
-    : bitmap_(src),
-      scale_factor_(ui::SCALE_FACTOR_NONE) {
-}
-
 ImageSkiaRep::ImageSkiaRep(const SkBitmap& src,
                            ui::ScaleFactor scale_factor)
     : bitmap_(src),
       scale_factor_(scale_factor) {
 }
 
-ImageSkiaRep& ImageSkiaRep::operator=(const SkBitmap& other) {
-  bitmap_ = other;
-  scale_factor_ = ui::SCALE_FACTOR_NONE;
-  return *this;
-}
-
-ImageSkiaRep::operator SkBitmap&() const {
-  return const_cast<SkBitmap&>(bitmap_);
-}
-
 int ImageSkiaRep::GetWidth() const {
   return static_cast<int>(bitmap_.width() /
       ui::GetScaleFactorScale(scale_factor_));
 }
 
 int ImageSkiaRep::GetHeight() const {
   return static_cast<int>(bitmap_.height() /
       ui::GetScaleFactorScale(scale_factor_));
 }
 
 float ImageSkiaRep::GetScale() const {
   return ui::GetScaleFactorScale(scale_factor_);
 }
 
 }  // namespace gfx