Fix remaining cc files to compile with Clang

cc/CCAnimationCurve.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CCAnimationCurve_h
 #define CCAnimationCurve_h
 
 #include <public/WebTransformationMatrix.h>
 #include <wtf/PassOwnPtr.h>
 
@@ skipping 20 matching lines @@
     const CCTransformAnimationCurve* toTransformAnimationCurve() const;
 };
 
 class CCFloatAnimationCurve : public CCAnimationCurve {
 public:
     virtual ~CCFloatAnimationCurve() { }
 
     virtual float getValue(double t) const = 0;
 
     // Partial CCAnimation implementation.
-    virtual Type type() const OVERRIDE { return Float; }
+    virtual Type type() const OVERRIDE;
 };
 
 class CCTransformAnimationCurve : public CCAnimationCurve {
 public:
     virtual ~CCTransformAnimationCurve() { }
 
     virtual WebKit::WebTransformationMatrix getValue(double t) const = 0;
 
     // Partial CCAnimation implementation.
-    virtual Type type() const OVERRIDE { return Transform; }
+    virtual Type type() const OVERRIDE;
 };
 
 } // namespace cc
 
 #endif // CCAnimation_h