Cleanup namespace usage in public/platform/{Web[P-W]*,linux/*}.h

public/platform/WebScrollOffsetAnimationCurve.h

 // Copyright 2014 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 WebScrollOffsetAnimationCurve_h
 #define WebScrollOffsetAnimationCurve_h
 
 #include "WebCompositorAnimationCurve.h"
-
 #include "WebFloatPoint.h"
 
 namespace blink {
 
 class WebScrollOffsetAnimationCurve : public WebCompositorAnimationCurve {
 public:
     virtual ~WebScrollOffsetAnimationCurve() { }
 
     virtual void setInitialValue(WebFloatPoint) = 0;
     virtual WebFloatPoint getValue(double time) const = 0;
     virtual double duration() const = 0;
 };
 
 } // namespace blink
 
 #endif // WebScrollOffsetAnimationCurve_h