Factor DartLibraryProvider out of DartLoader

sky/engine/tonic/dart_library_provider.cc

Index: sky/engine/tonic/dart_library_provider.cc
diff --git a/sky/engine/tonic/dart_class_provider.cc b/sky/engine/tonic/dart_library_provider.cc
similarity index 68%
copy from sky/engine/tonic/dart_class_provider.cc
copy to sky/engine/tonic/dart_library_provider.cc
index dc813b130b1c371937b8fd89f1d3da89681ca557..5a15662c3d45cf994ad4129587e3a311f22a6582 100644
--- a/sky/engine/tonic/dart_class_provider.cc
+++ b/sky/engine/tonic/dart_library_provider.cc
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "sky/engine/tonic/dart_class_provider.h"
+#include "sky/engine/tonic/dart_library_provider.h"
 
 namespace blink {
 
-DartClassProvider::~DartClassProvider() {
+DartLibraryProvider::~DartLibraryProvider() {
 }
 
 }  // namespace blink