content: Some code cleanup related to shared memory allocation.

content/renderer/render_thread_impl.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 "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 1358 matching lines @@
 void RenderThreadImpl::RecordAction(const base::UserMetricsAction& action) {
   Send(new ViewHostMsg_UserMetricsRecordAction(action.str_));
 }
 
 void RenderThreadImpl::RecordComputedAction(const std::string& action) {
   Send(new ViewHostMsg_UserMetricsRecordAction(action));
 }
 
 std::unique_ptr<base::SharedMemory>
 RenderThreadImpl::HostAllocateSharedMemoryBuffer(size_t size) {
-  return ChildThreadImpl::AllocateSharedMemory(size, thread_safe_sender(),
-                                               nullptr);
+  return ChildThreadImpl::AllocateSharedMemory(size);
 }
 
 cc::SharedBitmapManager* RenderThreadImpl::GetSharedBitmapManager() {
   return shared_bitmap_manager();
 }
 
 void RenderThreadImpl::RegisterExtension(v8::Extension* extension) {
   WebScriptController::registerExtension(extension);
 }
 
@@ skipping 1121 matching lines @@
   }
 }
 
 void RenderThreadImpl::OnRendererInterfaceRequest(
     mojom::RendererAssociatedRequest request) {
   DCHECK(!renderer_binding_.is_bound());
   renderer_binding_.Bind(std::move(request));
 }
 
 }  // namespace content