Remove unused references to included header files

cc/quads/content_draw_quad_base.h

 // Copyright 2013 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 CC_QUADS_CONTENT_DRAW_QUAD_BASE_H_
 #define CC_QUADS_CONTENT_DRAW_QUAD_BASE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/quads/draw_quad.h"
-#include "third_party/khronos/GLES2/gl2.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace cc {
 
 class CC_EXPORT ContentDrawQuadBase : public DrawQuad {
  public:
   void SetNew(const SharedQuadState* shared_quad_state,
               DrawQuad::Material material,
               const gfx::Rect& rect,
@@ skipping 22 matching lines @@
 
  protected:
   ContentDrawQuadBase();
   ~ContentDrawQuadBase() override;
   void ExtendValue(base::trace_event::TracedValue* value) const override;
 };
 
 }  // namespace cc
 
 #endif  // CC_QUADS_CONTENT_DRAW_QUAD_BASE_H_