Port more String and HashMap usages

services/sky/dart_library_provider_impl.cc

Index: services/sky/dart_library_provider_impl.cc
diff --git a/services/sky/dart_library_provider_impl.cc b/services/sky/dart_library_provider_impl.cc
index 953fbaf0d7b96540524adf445b2eee348a1e6f92..e21bfde46a172d868739f26588585d9b33e34be3 100644
--- a/services/sky/dart_library_provider_impl.cc
+++ b/services/sky/dart_library_provider_impl.cc
@@ -23,7 +23,7 @@ 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();