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

chrome/common/render_messages.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.
 
 // Multiply-included file, no traditional include guard.
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 // TODO(erg): This list has been temporarily annotated by erg while doing work
 // on which headers to pull out.
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "base/string16.h"
+#include "base/stringprintf.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "chrome/common/common_param_traits.h"
 #include "chrome/common/instant_types.h"
 #include "chrome/common/nacl_types.h"
 #include "chrome/common/search_provider.h"
 #include "chrome/common/thumbnail_score.h"
 #include "chrome/common/translate_errors.h"
 #include "chrome/common/view_types.h"
 #include "content/common/common_param_traits.h"
@@ skipping 440 matching lines @@
                     int32 /* page_id */,
                     bool  /* result */)
 
 // JavaScript related messages -----------------------------------------------
 
 // Notify the JavaScript engine in the render to change its parameters
 // while performing stress testing.
 IPC_MESSAGE_ROUTED2(ViewMsg_JavaScriptStressTestControl,
                     int /* cmd */,
                     int /* param */)