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

chrome/common/extensions/extension_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.
 
 // IPC messages for extensions.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 #include <vector>
 
-#include "base/shared_memory.h"
+#include "base/memory/shared_memory.h"
 #include "base/values.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/permissions/bluetooth_permission_data.h"
 #include "chrome/common/extensions/permissions/media_galleries_permission_data.h"
 #include "chrome/common/extensions/permissions/permission_set.h"
 #include "chrome/common/extensions/permissions/socket_permission_data.h"
 #include "chrome/common/extensions/permissions/usb_device_permission_data.h"
 #include "chrome/common/web_application_info.h"
 #include "content/public/common/common_param_traits.h"
 #include "content/public/common/socket_permission_request.h"
@@ skipping 620 matching lines @@
 // Notifies the browser process that a tab has started or stopped matching
 // certain conditions.  This message is sent in response to several events:
 //
 // * ExtensionMsg_WatchPages was received, updating the set of conditions.
 // * A new page is loaded.  This will be sent after ViewHostMsg_FrameNavigate.
 //   Currently this only fires for the main frame.
 // * Something changed on an existing frame causing the set of matching searches
 //   to change.
 IPC_MESSAGE_ROUTED1(ExtensionHostMsg_OnWatchedPageChange,
                     std::vector<std::string> /* Matching CSS selectors */)