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

cc/quads/render_pass.cc

Index: cc/quads/render_pass.cc
diff --git a/cc/quads/render_pass.cc b/cc/quads/render_pass.cc
index 5c4d98a33c96cbbf5f03f4b4f5740befe78057d9..637f5652d2d810c79bd9b09e7d02962990f4618f 100644
--- a/cc/quads/render_pass.cc
+++ b/cc/quads/render_pass.cc
@@ -12,7 +12,6 @@
 #include "cc/base/math_util.h"
 #include "cc/debug/traced_value.h"
 #include "cc/output/copy_output_request.h"
-#include "cc/quads/checkerboard_draw_quad.h"
 #include "cc/quads/debug_border_draw_quad.h"
 #include "cc/quads/draw_quad.h"
 #include "cc/quads/io_surface_draw_quad.h"
@@ -226,9 +225,6 @@ DrawQuad* RenderPass::CopyFromAndAppendDrawQuad(
     const DrawQuad* quad,
     const SharedQuadState* shared_quad_state) {
   switch (quad->material) {
-    case DrawQuad::CHECKERBOARD:
-      CopyFromAndAppendTypedDrawQuad<CheckerboardDrawQuad>(quad);
-      break;
     case DrawQuad::DEBUG_BORDER:
       CopyFromAndAppendTypedDrawQuad<DebugBorderDrawQuad>(quad);
       break;