Use std::string instead of mojo::String in //net.

chrome/browser/net/utility_process_mojo_proxy_resolver_factory.h

 // Copyright 2015 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 CHROME_BROWSER_NET_UTILITY_PROCESS_MOJO_PROXY_RESOLVER_FACTORY_H_
 #define CHROME_BROWSER_NET_UTILITY_PROCESS_MOJO_PROXY_RESOLVER_FACTORY_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 14 matching lines @@
 // utility process. All Mojo proxy resolver services will be run in the same
 // utility process. Utility process crashes are detected and the utility
 // process is automatically restarted.
 class UtilityProcessMojoProxyResolverFactory
     : public net::MojoProxyResolverFactory {
  public:
   static UtilityProcessMojoProxyResolverFactory* GetInstance();
 
   // Overridden from net::MojoProxyResolverFactory:
   std::unique_ptr<base::ScopedClosureRunner> CreateResolver(
-      const mojo::String& pac_script,
+      const std::string& pac_script,
       mojo::InterfaceRequest<net::interfaces::ProxyResolver> req,
       net::interfaces::ProxyResolverFactoryRequestClientPtr client) override;
 
  private:
   friend struct base::DefaultSingletonTraits<
       UtilityProcessMojoProxyResolverFactory>;
   UtilityProcessMojoProxyResolverFactory();
   ~UtilityProcessMojoProxyResolverFactory() override;
 
   // Error handler callback for |resolver_factory_|.
@@ skipping 16 matching lines @@
   size_t num_proxy_resolvers_ = 0;
 
   base::OneShotTimer idle_timer_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(UtilityProcessMojoProxyResolverFactory);
 };
 
 #endif  // CHROME_BROWSER_NET_UTILITY_PROCESS_MOJO_PROXY_RESOLVER_FACTORY_H_