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

content/ppapi_plugin/ppapi_thread.cc

 // 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.
 
 #include "content/ppapi_plugin/ppapi_thread.h"
 
 #include <limits>
 
 #include "base/process_util.h"
 #include "base/rand_util.h"
+#include "base/stringprintf.h"
 #include "content/common/child_process.h"
 #include "content/ppapi_plugin/broker_process_dispatcher.h"
 #include "content/ppapi_plugin/plugin_process_dispatcher.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_sync_channel.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppp.h"
 #include "ppapi/proxy/ppapi_messages.h"
 
 #if defined(OS_WIN)
@@ skipping 173 matching lines @@
 #if defined(OS_POSIX)
   // On POSIX, pass the renderer-side FD.
   handle->socket = base::FileDescriptor(::dup(dispatcher->GetRendererFD()),
                                         true);
 #endif
 
   // From here, the dispatcher will manage its own lifetime according to the
   // lifetime of the attached channel.
   return true;
 }