cc: Remove forbidden using namespace directives.

cc/quad_culler_unittest.cc

Index: cc/quad_culler_unittest.cc
diff --git a/cc/quad_culler_unittest.cc b/cc/quad_culler_unittest.cc
index dfcf147c3a663f2dbf42e97ecdd9601ca3aa39fc..b4dd8536eda5f77c78a1f8ff74679e1797f82ae6 100644
--- a/cc/quad_culler_unittest.cc
+++ b/cc/quad_culler_unittest.cc
@@ -18,9 +18,9 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include <public/WebTransformationMatrix.h>
 
-using namespace cc;
 using WebKit::WebTransformationMatrix;
 
+namespace cc {
 namespace {
 
 class TestOcclusionTrackerImpl : public OcclusionTrackerImpl {
@@ -466,5 +466,5 @@ TEST(QuadCullerTest, verifyWithoutMetrics)
     EXPECT_NEAR(occlusionTracker.overdrawMetrics().pixelsCulledForDrawing(), 0, 1);
 }
 
-
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc