cc: Remove legacy accelerated painting path

cc/output/gl_renderer.cc

 // Copyright 2010 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.
 
 #include "cc/output/gl_renderer.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 #include <string>
@@ skipping 137 matching lines @@
 
   context_->pushGroupMarkerEXT("CompositorContext");
 
   std::string extensions_string =
       UTF16ToASCII(context_->getString(GL_EXTENSIONS));
   std::vector<std::string> extensions_list;
   base::SplitString(extensions_string, ' ', &extensions_list);
   std::set<std::string> extensions(extensions_list.begin(),
                                    extensions_list.end());
 
-  if (Settings().accelerate_painting &&
-      extensions.count("GL_EXT_texture_format_BGRA8888") &&
-      extensions.count("GL_EXT_read_format_bgra"))
-    capabilities_.using_accelerated_painting = true;
-  else
-    capabilities_.using_accelerated_painting = false;
-
   capabilities_.using_partial_swap =
       Settings().partial_swap_enabled &&
       extensions.count("GL_CHROMIUM_post_sub_buffer");
 
   // Use the SwapBuffers callback only with the threaded proxy.
   if (client_->HasImplThread())
     capabilities_.using_swap_complete_callback =
         extensions.count("GL_CHROMIUM_swapbuffers_complete_callback") > 0;
 
   capabilities_.using_set_visibility =
@@ skipping 2736 matching lines @@
   // The Skia GPU backend requires a stencil buffer.  See ReinitializeGrCanvas
   // implementation.
   return gr_context_ && context_->getContextAttributes().stencil;
 }
 
 bool GLRenderer::IsContextLost() {
   return (context_->getGraphicsResetStatusARB() != GL_NO_ERROR);
 }
 
 }  // namespace cc