Use a direct include of the shared_memory header in base/, chrome/, components/.

chrome/common/render_messages.h

 // 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.
 
 // Multiply-included file, no traditional include guard.
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
+#include "base/memory/shared_memory.h"
 #include "base/process.h"
-#include "base/shared_memory.h"
 #include "base/strings/string16.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "chrome/common/autocomplete_match_type.h"
 #include "chrome/common/common_param_traits.h"
 #include "chrome/common/content_settings.h"
 #include "chrome/common/content_settings_pattern.h"
 #include "chrome/common/instant_types.h"
 #include "chrome/common/nacl_types.h"
@@ skipping 640 matching lines @@
 
 // Tells InstantExtended to undo one most visited item deletion.
 IPC_MESSAGE_ROUTED2(ChromeViewHostMsg_SearchBoxUndoMostVisitedDeletion,
                     int /* page_id */,
                     GURL /* url */)
 
 // Tells InstantExtended whether the page supports voice search.
 IPC_MESSAGE_ROUTED2(ChromeViewHostMsg_SetVoiceSearchSupported,
                     int /* page_id */,
                     bool /* supported */)