Remove SupportsWeakPtr inheritance from GLES2Decoder

gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc

 // Copyright (c) 2016 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/gles2_cmd_decoder_passthrough.h"
 
 #include "base/strings/string_split.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "ui/gl/gl_version_info.h"
@@ skipping 60 matching lines @@
 }
 
 GLES2DecoderPassthroughImpl::GLES2DecoderPassthroughImpl(ContextGroup* group)
     : commands_to_process_(0),
       debug_marker_manager_(),
       logger_(&debug_marker_manager_),
       surface_(),
       context_(),
       offscreen_(false),
       group_(group),
-      feature_info_(new FeatureInfo) {
+      feature_info_(new FeatureInfo),
+      weak_ptr_factory_(this) {
   DCHECK(group);
 }
 
 GLES2DecoderPassthroughImpl::~GLES2DecoderPassthroughImpl() {}
 
 GLES2Decoder::Error GLES2DecoderPassthroughImpl::DoCommands(
     unsigned int num_commands,
     const volatile void* buffer,
     int num_entries,
     int* entries_processed) {
@@ skipping 54 matching lines @@
 }
 
 const char* GLES2DecoderPassthroughImpl::GetCommandName(
     unsigned int command_id) const {
   if (command_id >= kFirstGLES2Command && command_id < kNumCommands) {
     return gles2::GetCommandName(static_cast<CommandId>(command_id));
   }
   return GetCommonCommandName(static_cast<cmd::CommandId>(command_id));
 }
 
+base::WeakPtr<GLES2Decoder> GLES2DecoderPassthroughImpl::AsWeakPtr() {
+  return weak_ptr_factory_.GetWeakPtr();
+}
+
 bool GLES2DecoderPassthroughImpl::Initialize(
     const scoped_refptr<gl::GLSurface>& surface,
     const scoped_refptr<gl::GLContext>& context,
     bool offscreen,
     const DisallowedFeatures& disallowed_features,
     const ContextCreationAttribHelper& attrib_helper) {
   // Take ownership of the context and surface. The surface can be replaced
   // with SetSurface.
   context_ = context;
   surface_ = surface;
@@ skipping 747 matching lines @@
   }, /* NOLINT */
 
 const GLES2DecoderPassthroughImpl::CommandInfo
     GLES2DecoderPassthroughImpl::command_info[] = {
         GLES2_COMMAND_LIST(GLES2_CMD_OP)};
 
 #undef GLES2_CMD_OP
 
 }  // namespace gles2
 }  // namespace gpu