cc: Remove forbidden using namespace directives.

cc/render_surface_filters_unittest.cc

Index: cc/render_surface_filters_unittest.cc
diff --git a/cc/render_surface_filters_unittest.cc b/cc/render_surface_filters_unittest.cc
index 05a15c14d61879d47e5d99a58fcbc448a5f13255..81daa082942b7c1449e79335388c15fe401c7344 100644
--- a/cc/render_surface_filters_unittest.cc
+++ b/cc/render_surface_filters_unittest.cc
@@ -11,9 +11,9 @@
 #include <public/WebFilterOperation.h>
 #include <public/WebFilterOperations.h>
 
-using namespace cc;
 using namespace WebKit;
 
+namespace cc {
 namespace {
 
 // Checks whether op can be combined with a following color matrix.
@@ -137,4 +137,5 @@ TEST(RenderSurfaceFiltersTest, testOptimize)
     EXPECT_EQ(3u, optimized.size());
 }
 
-}  // anonymous namespace
+}  // namespace
+}  // namespace cc