Factor DartLibraryProvider out of DartLoader

sky/engine/core/script/dart_dependency_catcher.cc

Index: sky/engine/core/script/dart_dependency_catcher.cc
diff --git a/sky/engine/core/script/dart_dependency_catcher.cc b/sky/engine/core/script/dart_dependency_catcher.cc
deleted file mode 100644
index aeefc37073a03faf4d4391c8231525109e1a7eea..0000000000000000000000000000000000000000
--- a/sky/engine/core/script/dart_dependency_catcher.cc
+++ /dev/null
@@ -1,23 +0,0 @@
-// 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 "sky/engine/core/script/dart_dependency_catcher.h"
-
-#include "sky/engine/core/script/dart_loader.h"
-
-namespace blink {
-
-DartDependencyCatcher::DartDependencyCatcher(DartLoader& loader) : loader_(loader) {
-  loader_.set_dependency_catcher(this);
-}
-
-DartDependencyCatcher::~DartDependencyCatcher() {
-  loader_.set_dependency_catcher(nullptr);
-}
-
-void DartDependencyCatcher::AddDependency(DartDependency* dependency) {
-  dependencies_.add(dependency);
-}
-
-}  // namespace blink