cc: Cleanup class/struct forward declarations

cc/output/dynamic_geometry_binding.h

 // Copyright 2015 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_OUTPUT_DYNAMIC_GEOMETRY_BINDING_H_
 #define CC_OUTPUT_DYNAMIC_GEOMETRY_BINDING_H_
 
 #include "base/macros.h"
 #include "cc/output/geometry_binding.h"
 
+namespace gfx {
+class QuadF;
+}
+
 namespace cc {
 
 class DynamicGeometryBinding {
  public:
   explicit DynamicGeometryBinding(gpu::gles2::GLES2Interface* gl);
   void PrepareForDraw();
   void InitializeCustomQuad(const gfx::QuadF& quad);
   void InitializeCustomQuadWithUVs(const gfx::QuadF& quad, const float uv[8]);
 
  private:
   gpu::gles2::GLES2Interface* gl_;
 
   GLuint quad_vertices_vbo_;
   GLuint quad_elements_vbo_;
 
   DISALLOW_COPY_AND_ASSIGN(DynamicGeometryBinding);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_DYNAMIC_GEOMETRY_BINDING_H_