Remove SupportsWeakPtr inheritance from GLES2Decoder

gpu/command_buffer/service/context_group.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/service/context_group.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 121 matching lines @@
                 << "not available.";
     return false;
   }
   if (HaveContexts()) {
     if (context_type != feature_info_->context_type()) {
       DLOG(ERROR) << "ContextGroup::Initialize failed because the type of "
                   << "the context does not fit with the group.";
       return false;
     }
     // If we've already initialized the group just add the context.
-    decoders_.push_back(base::AsWeakPtr<GLES2Decoder>(decoder));
+    decoders_.push_back(decoder->AsWeakPtr());
     return true;
   }
 
   DisallowedFeatures adjusted_disallowed_features =
       AdjustDisallowedFeatures(context_type, disallowed_features);
 
   if (!feature_info_->Initialize(context_type, adjusted_disallowed_features)) {
     DLOG(ERROR) << "ContextGroup::Initialize failed because FeatureInfo "
                 << "initialization failed.";
     return false;
@@ skipping 294 matching lines @@
       program_cache_, max_varying_vectors_, max_draw_buffers_,
       max_dual_source_draw_buffers_, max_vertex_attribs_, gpu_preferences_,
       feature_info_.get(), progress_reporter_));
 
   if (!texture_manager_->Initialize()) {
     DLOG(ERROR) << "Context::Group::Initialize failed because texture manager "
                 << "failed to initialize.";
     return false;
   }
 
-  decoders_.push_back(base::AsWeakPtr<GLES2Decoder>(decoder));
+  decoders_.push_back(decoder->AsWeakPtr());
   return true;
 }
 
 namespace {
 
 bool IsNull(const base::WeakPtr<gles2::GLES2Decoder>& decoder) {
   return !decoder.get();
 }
 
 template <typename T>
@@ skipping 151 matching lines @@
     GLuint client_id, GLuint* service_id) const {
   Buffer* buffer = buffer_manager_->GetBuffer(client_id);
   if (!buffer)
     return false;
   *service_id = buffer->service_id();
   return true;
 }
 
 }  // namespace gles2
 }  // namespace gpu