Minor scoped_refptr cleanup in cc::OutputSurface.

cc/output/output_surface.cc

 // Copyright (c) 2013 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/output/output_surface.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 15 matching lines @@
 #include "ui/gfx/frame_time.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 
 using std::set;
 using std::string;
 using std::vector;
 
 namespace cc {
 
-OutputSurface::OutputSurface(scoped_refptr<ContextProvider> context_provider)
+OutputSurface::OutputSurface(
+    const scoped_refptr<ContextProvider>& context_provider)
     : client_(NULL),
       context_provider_(context_provider),
       device_scale_factor_(-1),
       external_stencil_test_enabled_(false),
       weak_ptr_factory_(this) {
 }
 
 OutputSurface::OutputSurface(scoped_ptr<SoftwareOutputDevice> software_device)
     : client_(NULL),
       software_device_(software_device.Pass()),
       device_scale_factor_(-1),
       external_stencil_test_enabled_(false),
       weak_ptr_factory_(this) {
 }
 
-OutputSurface::OutputSurface(scoped_refptr<ContextProvider> context_provider,
-                             scoped_ptr<SoftwareOutputDevice> software_device)
+OutputSurface::OutputSurface(
+    const scoped_refptr<ContextProvider>& context_provider,
+    scoped_ptr<SoftwareOutputDevice> software_device)
     : client_(NULL),
       context_provider_(context_provider),
       software_device_(software_device.Pass()),
       device_scale_factor_(-1),
       external_stencil_test_enabled_(false),
       weak_ptr_factory_(this) {
 }
 
 void OutputSurface::CommitVSyncParameters(base::TimeTicks timebase,
                                           base::TimeDelta interval) {
@@ skipping 198 matching lines @@
   TRACE_EVENT1("cc", "OutputSurface::SetMemoryPolicy",
                "bytes_limit_when_visible", policy.bytes_limit_when_visible);
   // Just ignore the memory manager when it says to set the limit to zero
   // bytes. This will happen when the memory manager thinks that the renderer
   // is not visible (which the renderer knows better).
   if (policy.bytes_limit_when_visible)
     client_->SetMemoryPolicy(policy);
 }
 
 }  // namespace cc