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

cc/output/gl_renderer.h

Index: cc/output/gl_renderer.h
diff --git a/cc/output/gl_renderer.h b/cc/output/gl_renderer.h
index d80e156150277c34cb205d966b300cf38c1cac29..f46504d95c6e3dc0e0a4232e952a6fc7cf2801c2 100644
--- a/cc/output/gl_renderer.h
+++ b/cc/output/gl_renderer.h
@@ -13,7 +13,6 @@
 #include "cc/output/gl_renderer_draw_cache.h"
 #include "cc/output/program_binding.h"
 #include "cc/output/renderer.h"
-#include "cc/quads/checkerboard_draw_quad.h"
 #include "cc/quads/debug_border_draw_quad.h"
 #include "cc/quads/io_surface_draw_quad.h"
 #include "cc/quads/render_pass_draw_quad.h"
@@ -154,9 +153,6 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
   void ClearFramebuffer(DrawingFrame* frame);
   void SetViewport();
 
-  void DrawCheckerboardQuad(const DrawingFrame* frame,
-                            const CheckerboardDrawQuad* quad,
-                            const gfx::QuadF* clip_region);
   void DrawDebugBorderQuad(const DrawingFrame* frame,
                            const DebugBorderDrawQuad* quad);
   static bool IsDefaultBlendMode(SkXfermode::Mode blend_mode) {
@@ -294,8 +290,6 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
       TileProgramSwizzle;
   typedef ProgramBinding<VertexShaderTile, FragmentShaderRGBATexSwizzleOpaque>
       TileProgramSwizzleOpaque;
-  typedef ProgramBinding<VertexShaderPosTex, FragmentShaderCheckerboard>
-      TileCheckerboardProgram;
 
   // Texture shaders.
   typedef ProgramBinding<VertexShaderPosTexTransform,
@@ -362,8 +356,6 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
   const TileProgramSwizzleAA* GetTileProgramSwizzleAA(
       TexCoordPrecision precision, SamplerType sampler);
 
-  const TileCheckerboardProgram* GetTileCheckerboardProgram();
-
   const RenderPassProgram* GetRenderPassProgram(TexCoordPrecision precision,
                                                 BlendMode blend_mode);
   const RenderPassProgramAA* GetRenderPassProgramAA(TexCoordPrecision precision,
@@ -434,8 +426,6 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
   TileProgramSwizzleAA tile_program_swizzle_aa_[LAST_TEX_COORD_PRECISION +
                                                 1][LAST_SAMPLER_TYPE + 1];
 
-  TileCheckerboardProgram tile_checkerboard_program_;
-
   TextureProgram
       texture_program_[LAST_TEX_COORD_PRECISION + 1][LAST_SAMPLER_TYPE + 1];
   NonPremultipliedTextureProgram