Remove static thread pointers from CC

cc/occlusion_tracker_unittest.cc

Index: cc/occlusion_tracker_unittest.cc
diff --git a/cc/occlusion_tracker_unittest.cc b/cc/occlusion_tracker_unittest.cc
index c47d66a996a32eaccd07ee9b60b92a6746ba14af..4b3d20899fe2341d1e37048210ae43941d11f6fa 100644
--- a/cc/occlusion_tracker_unittest.cc
+++ b/cc/occlusion_tracker_unittest.cc
@@ -425,14 +425,12 @@ private:
 
 #define RUN_TEST_IMPL_THREAD_OPAQUE_LAYERS(ClassName) \
     class ClassName##ImplThreadOpaqueLayers : public ClassName<OcclusionTrackerTestImplThreadTypes> { \
-        DebugScopedSetImplThread impl; \
     public: \
         ClassName##ImplThreadOpaqueLayers() : ClassName<OcclusionTrackerTestImplThreadTypes>(true) { } \
     }; \
     TEST_F(ClassName##ImplThreadOpaqueLayers, runTest) { runMyTest(); }
 #define RUN_TEST_IMPL_THREAD_OPAQUE_PAINTS(ClassName) \
     class ClassName##ImplThreadOpaquePaints : public ClassName<OcclusionTrackerTestImplThreadTypes> { \
-        DebugScopedSetImplThread impl; \
     public: \
         ClassName##ImplThreadOpaquePaints() : ClassName<OcclusionTrackerTestImplThreadTypes>(false) { } \
     }; \