[chromium] Pass SkBitmap by reference in WebNinePatchLayer::setBitmap and refactor

cc/blink/web_nine_patch_layer_impl.cc

 // Copyright 2014 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 "cc/blink/web_nine_patch_layer_impl.h"
 
 #include "base/command_line.h"
 #include "cc/base/switches.h"
 #include "cc/blink/web_layer_impl.h"
 #include "cc/blink/web_layer_impl_fixed_bounds.h"
@@ skipping 16 matching lines @@
 void WebNinePatchLayerImpl::setBitmap(SkBitmap bitmap,
                                       const blink::WebRect& aperture) {
   setBitmap(bitmap);
   setAperture(aperture);
   setBorder(blink::WebRect(aperture.x,
                            aperture.y,
                            bitmap.width() - aperture.width,
                            bitmap.height() - aperture.height));
 }
 
-void WebNinePatchLayerImpl::setBitmap(SkBitmap bitmap) {
+void WebNinePatchLayerImpl::setBitmap(const SkBitmap& bitmap) {
   cc::NinePatchLayer* nine_patch =
       static_cast<cc::NinePatchLayer*>(layer_->layer());
   nine_patch->SetBitmap(bitmap);
 }
 
 void WebNinePatchLayerImpl::setAperture(const blink::WebRect& aperture) {
   cc::NinePatchLayer* nine_patch =
       static_cast<cc::NinePatchLayer*>(layer_->layer());
   nine_patch->SetAperture(gfx::Rect(aperture));
 }
 
 void WebNinePatchLayerImpl::setBorder(const blink::WebRect& border) {
   cc::NinePatchLayer* nine_patch =
       static_cast<cc::NinePatchLayer*>(layer_->layer());
   nine_patch->SetBorder(gfx::Rect(border));
 }
 
-void WebNinePatchLayerImpl::setFillCenter(bool fill_center) {
-  cc::NinePatchLayer* nine_patch =
-      static_cast<cc::NinePatchLayer*>(layer_->layer());
-  nine_patch->SetFillCenter(fill_center);
-}
-
 }  // namespace cc_blink