Fix remaining cc files to compile with Clang

cc/CCHeadsUpDisplayLayerImpl.h

Index: cc/CCHeadsUpDisplayLayerImpl.h
diff --git a/cc/CCHeadsUpDisplayLayerImpl.h b/cc/CCHeadsUpDisplayLayerImpl.h
index de8f95bd5f35b4d6683b789d96ebf1f7769cd555..cc72100052e282f338da9d7d5aff41188e9f9126 100644
--- a/cc/CCHeadsUpDisplayLayerImpl.h
+++ b/cc/CCHeadsUpDisplayLayerImpl.h
@@ -34,12 +34,12 @@ public:
 
     virtual void didLoseContext() OVERRIDE;
 
-    virtual bool layerIsAlwaysDamaged() const OVERRIDE { return true; }
+    virtual bool layerIsAlwaysDamaged() const OVERRIDE;
 
 private:
     explicit CCHeadsUpDisplayLayerImpl(int);
 
-    virtual const char* layerTypeAsString() const OVERRIDE { return "HeadsUpDisplayLayer"; }
+    virtual const char* layerTypeAsString() const OVERRIDE;
 
     void drawHudContents(SkCanvas*);
     void drawFPSCounter(SkCanvas*, CCFrameRateCounter*, int top, int height);