Add explicit base namespace to string16 users.

chrome/common/automation_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 message file, no traditional include guard.
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
@@ skipping 11 matching lines @@
 #include "net/url_request/url_request_status.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/gfx/rect.h"
 #include "url/gurl.h"
 
 IPC_ENUM_TRAITS(AutomationMsg_NavigationResponseValues)
 IPC_ENUM_TRAITS(content::PageType)
 
 IPC_STRUCT_BEGIN(AutomationMsg_Find_Params)
   // The word(s) to find on the page.
-  IPC_STRUCT_MEMBER(string16, search_string)
+  IPC_STRUCT_MEMBER(base::string16, search_string)
 
   // Whether to search forward or backward within the page.
   IPC_STRUCT_MEMBER(bool, forward)
 
   // Whether search should be Case sensitive.
   IPC_STRUCT_MEMBER(bool, match_case)
 
   // Whether this operation is first request (Find) or a follow-up (FindNext).
   IPC_STRUCT_MEMBER(bool, find_next)
 IPC_STRUCT_END()
@@ skipping 172 matching lines @@
   static void Log(const param_type& p, std::string* l);
 };
 
 }  // namespace IPC
 
 #endif  // CHROME_COMMON_AUTOMATION_MESSAGES_H_
 
 // Keep this internal message file unchanged to preserve line numbering
 // (and hence the dubious __LINE__-based message numberings) across versions.
 #include "chrome/common/automation_messages_internal.h"