Factor DartLibraryProvider out of DartLoader

sky/engine/core/script/dart_snapshot_loader.h

Index: sky/engine/core/script/dart_snapshot_loader.h
diff --git a/sky/engine/core/script/dart_snapshot_loader.h b/sky/engine/core/script/dart_snapshot_loader.h
deleted file mode 100644
index 43930069d3ed955ce67f49f4b63b15a83fd1afb6..0000000000000000000000000000000000000000
--- a/sky/engine/core/script/dart_snapshot_loader.h
+++ /dev/null
@@ -1,55 +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.
-
-#ifndef SKY_ENGINE_CORE_SCRIPT_DART_SNAPSHOT_LOADER_H_
-#define SKY_ENGINE_CORE_SCRIPT_DART_SNAPSHOT_LOADER_H_
-
-#include "base/callback_forward.h"
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "dart/runtime/include/dart_api.h"
-#include "mojo/common/data_pipe_drainer.h"
-#include "mojo/services/network/public/interfaces/url_loader.mojom.h"
-#include "sky/engine/platform/fetcher/MojoFetcher.h"
-#include "sky/engine/wtf/OwnPtr.h"
-#include "sky/engine/wtf/Vector.h"
-#include "sky/engine/wtf/text/WTFString.h"
-
-namespace blink {
-
-class DartState;
-class KURL;
-
-class DartSnapshotLoader : public MojoFetcher::Client,
-                           public mojo::common::DataPipeDrainer::Client {
- public:
-  explicit DartSnapshotLoader(DartState* dart_state);
-  ~DartSnapshotLoader();
-
-  void LoadSnapshot(const KURL& url, mojo::URLResponsePtr response,
-                    const base::Closure& callback);
-
-  DartState* dart_state() const { return dart_state_.get(); }
-
- private:
-  // MojoFetcher::Client
-  void OnReceivedResponse(mojo::URLResponsePtr response) override;
-
-  // mojo::common::DataPipeDrainer::Client
-  void OnDataAvailable(const void* data, size_t num_bytes) override;
-  void OnDataComplete() override;
-
-  base::WeakPtr<DartState> dart_state_;
-  // TODO(abarth): Should we be using SharedBuffer to buffer the data?
-  Vector<uint8_t> buffer_;
-  OwnPtr<MojoFetcher> fetcher_;
-  OwnPtr<mojo::common::DataPipeDrainer> drainer_;
-  base::Closure callback_;
-
-  DISALLOW_COPY_AND_ASSIGN(DartSnapshotLoader);
-};
-
-}  // namespace blink
-
-#endif  // SKY_ENGINE_CORE_SCRIPT_DART_SNAPSHOT_LOADER_H_