cc: Convert non-const reference arguments to pointers.

cc/base/region_unittest.cc

Index: cc/base/region_unittest.cc
diff --git a/cc/base/region_unittest.cc b/cc/base/region_unittest.cc
index 20379ba086172b1df61706c83c0ce2d6143a0bec..c9a218d692a7b95f68f8c6fb693ae9c2563b86bc 100644
--- a/cc/base/region_unittest.cc
+++ b/cc/base/region_unittest.cc
@@ -437,7 +437,7 @@ 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());
 
@@ -445,7 +445,7 @@ TEST(RegionSwap, Swap) {
   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());
 }