cc: Unify namespaces for all test files

cc/test/render_pass_test_common.cc

Index: cc/test/render_pass_test_common.cc
diff --git a/cc/test/render_pass_test_common.cc b/cc/test/render_pass_test_common.cc
index e50912d23d091a8e641c2d03e7d1314c58365c7a..c00a1dc786716e98e8e745b4ae0b8463c626871a 100644
--- a/cc/test/render_pass_test_common.cc
+++ b/cc/test/render_pass_test_common.cc
@@ -17,9 +17,7 @@
 #include "cc/resource_provider.h"
 #include "ui/gfx/transform.h"
 
-namespace WebKitTests {
-
-using cc::DrawQuad;
+namespace cc {
 
 void TestRenderPass::AppendOneOfEveryQuadType(cc::ResourceProvider* resourceProvider) {
   gfx::Rect rect(0, 0, 100, 100);
@@ -170,4 +168,4 @@ void TestRenderPass::AppendOneOfEveryQuadType(cc::ResourceProvider* resourceProv
   AppendSharedQuadState(shared_state.Pass());
 }
 
-}  // namespace WebKitTests
+}  // namespace cc