cc: Convert non-const reference arguments to pointers.

cc/base/region_unittest.cc

 // Copyright 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"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
@@ skipping 419 matching lines @@
   r.Union(gfx::Rect(0, 0, 500, 500));
   EXPECT_FALSE(r.IsEmpty());
   r.Clear();
   EXPECT_TRUE(r.IsEmpty());
 }
 
 TEST(RegionSwap, Swap) {
   Region r1, r2, r3;
 
   r1 = gfx::Rect(0, 0, 50, 50);
-  r1.Swap(r2);
+  r1.Swap(&r2);
   EXPECT_TRUE(r1.IsEmpty());
   EXPECT_EQ(r2.ToString(), Region(gfx::Rect(0, 0, 50, 50)).ToString());
 
   r1 = gfx::Rect(0, 0, 50, 50);
   r1.Union(gfx::Rect(100, 0, 50, 50));
   r1.Union(gfx::Rect(0, 0, 500, 500));
   r3 = r1;
-  r1.Swap(r2);
+  r1.Swap(&r2);
   EXPECT_EQ(r1.ToString(), Region(gfx::Rect(0, 0, 50, 50)).ToString());
   EXPECT_EQ(r2.ToString(), r3.ToString());
 }
 
 }  // namespace
 }  // namespace cc