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 478c2cc106e673a5c9322033e7834b11cb6233f5..61416d6a5c4d627ccfce7455c6979f2e9f56c3b2 100644
--- a/cc/occlusion_tracker_unittest.cc
+++ b/cc/occlusion_tracker_unittest.cc
@@ -411,14 +411,12 @@ 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) { } \
     }; \