iwyu: Include stringprintf.h where appropriate, part 1.

ipc/ipc_message_utils.h

 // Copyright (c) 2011 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.
 
 #ifndef IPC_IPC_MESSAGE_UTILS_H_
 #define IPC_IPC_MESSAGE_UTILS_H_
 #pragma once
 
 #include <algorithm>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/format_macros.h"
 #include "base/string16.h"
+#include "base/stringprintf.h"
 #include "base/string_util.h"
 #include "base/tuple.h"
 #include "ipc/ipc_param_traits.h"
 #include "ipc/ipc_sync_message.h"
 
 #if defined(COMPILER_GCC)
 // GCC "helpfully" tries to inline template methods in release mode. Except we
 // want the majority of the template junk being expanded once in the
 // implementation file (and only provide the definitions in
 // ipc_message_utils_impl.h in those files) and exported, instead of expanded
@@ skipping 1190 matching lines @@
     ReplyParam p(a, b, c, d, e);
     WriteParam(reply, p);
   }
 };
 
 //-----------------------------------------------------------------------------
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_MESSAGE_UTILS_H_