cc: Remove code for drawing checkerboard quads, it's not used.

cc/output/shader.h

 // Copyright 2011 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_SHADER_H_
 #define CC_OUTPUT_SHADER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 850 matching lines @@
             unsigned program,
             int* base_uniform_index);
   int color_location() const { return color_location_; }
 
  private:
   int color_location_;
 
   DISALLOW_COPY_AND_ASSIGN(FragmentShaderColorAA);
 };
 
-class FragmentShaderCheckerboard : public FragmentTexBlendMode {
- public:
-  FragmentShaderCheckerboard();
-  std::string GetShaderString(
-      TexCoordPrecision precision, SamplerType sampler) const;
-  static std::string GetShaderHead();
-  static std::string GetShaderBody();
-
-  void Init(gpu::gles2::GLES2Interface* context,
-            unsigned program,
-            int* base_uniform_index);
-  int alpha_location() const { return alpha_location_; }
-  int tex_transform_location() const { return tex_transform_location_; }
-  int frequency_location() const { return frequency_location_; }
-  int color_location() const { return color_location_; }
-
- private:
-  int alpha_location_;
-  int tex_transform_location_;
-  int frequency_location_;
-  int color_location_;
-
-  DISALLOW_COPY_AND_ASSIGN(FragmentShaderCheckerboard);
-};
-
 }  // namespace cc
 
 #endif  // CC_OUTPUT_SHADER_H_