content: Some code cleanup related to shared memory allocation.

content/child/blob_storage/webblobregistry_impl.cc

 // Copyright 2013 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/child/blob_storage/webblobregistry_impl.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/guid.h"
 #include "base/location.h"
@@ skipping 130 matching lines @@
   if (length <= limits_.max_ipc_memory_size) {
     DataElement item;
     item.SetToBytes(data, length);
     sender_->Send(new StreamHostMsg_AppendBlobDataItem(url, item));
   } else {
     // We handle larger amounts of data via SharedMemory instead of
     // writing it directly to the IPC channel.
     size_t shared_memory_size =
         std::min(length, limits_.max_shared_memory_size);
     std::unique_ptr<base::SharedMemory> shared_memory(
-        ChildThreadImpl::AllocateSharedMemory(shared_memory_size,
-                                              sender_.get(), nullptr));
+        ChildThreadImpl::AllocateSharedMemory(shared_memory_size));
     CHECK(shared_memory.get());
     if (!shared_memory->Map(shared_memory_size))
       CHECK(false);
 
     size_t remaining_bytes = length;
     const char* current_ptr = data;
     while (remaining_bytes) {
       size_t chunk_size = std::min(remaining_bytes, shared_memory_size);
       memcpy(shared_memory->memory(), current_ptr, chunk_size);
       sender_->Send(new StreamHostMsg_SyncAppendSharedMemory(
@@ skipping 71 matching lines @@
                                     expected_modification_time);
 }
 
 void WebBlobRegistryImpl::BuilderImpl::build() {
   BlobTransportController::InitiateBlobTransfer(
       uuid_, content_type_, std::move(consolidation_), sender_,
       io_runner_.get(), main_runner_);
 }
 
 }  // namespace content