cc: Convert non-const reference arguments to pointers.

cc/base/region.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 "cc/base/region.h"
 
 namespace cc {
 
 Region::Region() {
 }
@@ skipping 12 matching lines @@
 const Region& Region::operator=(gfx::Rect rect) {
   skregion_ = SkRegion(gfx::RectToSkIRect(rect));
   return *this;
 }
 
 const Region& Region::operator=(const Region& region) {
   skregion_ = region.skregion_;
   return *this;
 }
 
-void Region::Swap(Region& region) {
-  region.skregion_.swap(skregion_);
+void Region::Swap(Region* region) {
+  region->skregion_.swap(skregion_);
 }
 
 void Region::Clear() {
   skregion_.setEmpty();
 }
 
 bool Region::IsEmpty() const {
   return skregion_.isEmpty();
 }
 
@@ skipping 62 matching lines @@
 }
 
 Region::Iterator::Iterator(const Region& region)
     : it_(region.skregion_) {
 }
 
 Region::Iterator::~Iterator() {
 }
 
 }  // namespace cc