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 e7462620d7eeb2c3c54f9dcc47f4301cef243384..6ee7ceca6af729bf25e378f0a09cd9d42e7a54d6 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) { } \
     }; \