Port more String and HashMap usages

services/sky/dart_library_provider_impl.cc

 // 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.
 
 #include "services/sky/dart_library_provider_impl.h"
 
 namespace sky {
 
 DartLibraryProviderImpl::PrefetchedLibrary::PrefetchedLibrary() {
 }
 
 DartLibraryProviderImpl::PrefetchedLibrary::~PrefetchedLibrary() {
 }
 
 DartLibraryProviderImpl::DartLibraryProviderImpl(
     mojo::NetworkService* network_service,
     scoped_ptr<PrefetchedLibrary> prefetched)
     : shell::DartLibraryProviderNetwork(network_service),
       prefetched_library_(prefetched.Pass()) {
 }
 
 DartLibraryProviderImpl::~DartLibraryProviderImpl() {
 }
 
 void DartLibraryProviderImpl::GetLibraryAsStream(
-    const String& name,
+    const std::string& name,
     blink::DataPipeConsumerCallback callback) {
   if (prefetched_library_ && prefetched_library_->name == name) {
     mojo::ScopedDataPipeConsumerHandle pipe = prefetched_library_->pipe.Pass();
     prefetched_library_ = nullptr;
     callback.Run(pipe.Pass());
     return;
   }
 
   shell::DartLibraryProviderNetwork::GetLibraryAsStream(name, callback);
 }
 
 }  // namespace sky