Remove some unneeded DEPS from //sky

sky/engine/platform/graphics/gpu/Extensions3DUtil.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 SKY_ENGINE_PLATFORM_GRAPHICS_GPU_EXTENSIONS3DUTIL_H_
-#define SKY_ENGINE_PLATFORM_GRAPHICS_GPU_EXTENSIONS3DUTIL_H_
-
-#include "sky/engine/platform/PlatformExport.h"
-#include "sky/engine/platform/graphics/GraphicsTypes3D.h"
-#include "sky/engine/wtf/HashSet.h"
-#include "sky/engine/wtf/text/WTFString.h"
-#include "third_party/khronos/GLES2/gl2.h"
-#include "third_party/khronos/GLES2/gl2ext.h"
-
-namespace blink {
-
-class WebGraphicsContext3D;
-
-class PLATFORM_EXPORT Extensions3DUtil {
-public:
-    // Creates a new Extensions3DUtil. If the passed WebGraphicsContext3D has been spontaneously lost, returns null.
-    static PassOwnPtr<Extensions3DUtil> create(WebGraphicsContext3D*);
-    ~Extensions3DUtil();
-
-    bool supportsExtension(const String& name);
-    bool ensureExtensionEnabled(const String& name);
-    bool isExtensionEnabled(const String& name);
-
-    static bool canUseCopyTextureCHROMIUM(GLenum destFormat, GLenum destType, GLint level);
-
-private:
-    Extensions3DUtil(WebGraphicsContext3D*);
-    bool initializeExtensions();
-
-    WebGraphicsContext3D* m_context;
-    HashSet<String> m_enabledExtensions;
-    HashSet<String> m_requestableExtensions;
-};
-
-} // namespace blink
-
-#endif  // SKY_ENGINE_PLATFORM_GRAPHICS_GPU_EXTENSIONS3DUTIL_H_