Fix Win Clang -Wpessimizing-move error

ipc/attachment_broker_privileged_win_unittest.cc

 // Copyright 2015 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 "build/build_config.h"
 
 #include <windows.h>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 84 matching lines @@
   if (!success) {
     LOG(INFO) << "Failed to deserialize message.";
     return nullptr;
   }
 
   base::SharedMemoryHandle handle = base::get<0>(p);
   scoped_ptr<base::SharedMemory> shared_memory(
       new base::SharedMemory(handle, false));
 
   shared_memory->Map(size);
-  return std::move(shared_memory);
+  return shared_memory;
 }
 
 // |message| must be deserializable as a TestTwoHandleWinMsg. Returns the
 // HANDLE, or nullptr if deserialization failed.
 bool GetHandleFromTestTwoHandleWinMsg(const IPC::Message& message,
                                       HANDLE* h1,
                                       HANDLE* h2) {
   // Expect a message with a brokered attachment.
   if (!message.HasBrokerableAttachments()) {
     LOG(INFO) << "Message missing brokerable attachment.";
@@ skipping 527 matching lines @@
       memcmp(shared_memory->memory(), kDataBuffer, strlen(kDataBuffer)) == 0;
   SendControlMessage(sender, success);
 }
 
 MULTIPROCESS_IPC_TEST_CLIENT_MAIN(SendSharedMemoryHandle) {
   return CommonPrivilegedProcessMain(&SendSharedMemoryHandleCallback,
                                      "SendSharedMemoryHandle");
 }
 
 }  // namespace