Use a direct include of utf_string_conversions.h in content/.

content/common/pepper_plugin_registry.cc

 // 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.
 
 #include "content/common/pepper_plugin_registry.h"
 
 #include "base/command_line.h"
 #include "base/native_library.h"
 #include "base/string_util.h"
 #include "base/strings/string_split.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
 #include "ppapi/shared_impl/ppapi_permissions.h"
 
 namespace content {
 namespace {
 
 // Appends any plugins from the command line to the given vector.
 void ComputePluginsFromCommandLine(std::vector<PepperPluginInfo>* plugins) {
   bool out_of_process = true;
@@ skipping 218 matching lines @@
       if (!module->InitAsLibrary(current.path)) {
         DLOG(ERROR) << "Failed to load pepper module: " << current.path.value();
         continue;
       }
     }
     preloaded_modules_[current.path] = module;
   }
 }
 
 }  // namespace content