Make gfx::Rect class operations consistently mutate the class they are called on.

content/common/gpu/image_transport_surface.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.
 
 #if defined(ENABLE_GPU)
 
 #include "content/common/gpu/image_transport_surface.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 12 matching lines @@
 ImageTransportSurface::~ImageTransportSurface() {}
 
 void ImageTransportSurface::OnSetFrontSurfaceIsProtected(
     bool is_protected, uint32 protection_state_id) {
 }
 
 void ImageTransportSurface::GetRegionsToCopy(
     const gfx::Rect& previous_damage_rect,
     const gfx::Rect& new_damage_rect,
     std::vector<gfx::Rect>* regions) {
-  gfx::Rect intersection = previous_damage_rect.Intersect(new_damage_rect);
+  gfx::Rect intersection = previous_damage_rect;
+  intersection.Intersect(new_damage_rect);
 
   if (intersection.IsEmpty()) {
     regions->push_back(previous_damage_rect);
     return;
   }
 
   // Top (above the intersection).
   regions->push_back(gfx::Rect(previous_damage_rect.x(),
       previous_damage_rect.y(),
       previous_damage_rect.width(),
@@ skipping 287 matching lines @@
   }
 }
 
 gfx::Size PassThroughImageTransportSurface::GetSize() {
   return GLSurfaceAdapter::GetSize();
 }
 
 PassThroughImageTransportSurface::~PassThroughImageTransportSurface() {}
 
 #endif  // defined(ENABLE_GPU)