Remove static thread pointers from CC

cc/software_renderer_unittest.cc

Index: cc/software_renderer_unittest.cc
diff --git a/cc/software_renderer_unittest.cc b/cc/software_renderer_unittest.cc
index 8f977e06bb7cc0b1ac72fb52a599afd5a93c72f1..e0fd5dd9a72dfe1c3ca637e460fdd47568e30b3c 100644
--- a/cc/software_renderer_unittest.cc
+++ b/cc/software_renderer_unittest.cc
@@ -10,7 +10,6 @@
 #include "cc/render_pass.h"
 #include "cc/render_pass_draw_quad.h"
 #include "cc/settings.h"
-#include "cc/single_thread_proxy.h" // For DebugScopedSetImplThread
 #include "cc/solid_color_draw_quad.h"
 #include "cc/test/animation_test_common.h"
 #include "cc/test/fake_web_compositor_output_surface.h"
@@ -50,10 +49,9 @@ public:
     virtual void setFullRootLayerDamage() OVERRIDE { }
     virtual void setManagedMemoryPolicy(const ManagedMemoryPolicy& policy) OVERRIDE { };
     virtual void enforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy) OVERRIDE { };
+    virtual bool hasImplThread() const OVERRIDE { return false; }
 
 protected:
-    DebugScopedSetImplThread m_alwaysImplThread;
-
     scoped_ptr<FakeWebCompositorOutputSurface> m_outputSurface;
     scoped_ptr<ResourceProvider> m_resourceProvider;
     scoped_ptr<SoftwareRenderer> m_renderer;