Port more uses of OwnPtr to std::unique_ptr

sky/engine/tonic/dart_library_loader.h

 // 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_TONIC_DART_LIBRARY_LOADER_H_
 #define SKY_ENGINE_TONIC_DART_LIBRARY_LOADER_H_
 
 #include <memory>
 #include <string>
 #include <unordered_map>
 #include <unordered_set>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "dart/runtime/include/dart_api.h"
-#include "sky/engine/wtf/OwnPtr.h"
 
 namespace blink {
 class DartDependency;
 class DartDependencyCatcher;
 class DartLibraryProvider;
 class DartState;
 
 // TODO(abarth): This class seems more complicated than it needs to be. Is
 // there some way of simplifying this system? For example, we have a bunch
 // of inner classes that could potentially be factored out in some other way.
@@ skipping 48 matching lines @@
   std::unordered_set<std::unique_ptr<Job>> jobs_;
   std::unordered_set<std::unique_ptr<DependencyWatcher>> dependency_watchers_;
   DartDependencyCatcher* dependency_catcher_;
 
   DISALLOW_COPY_AND_ASSIGN(DartLibraryLoader);
 };
 
 }  // namespace blink
 
 #endif  // SKY_ENGINE_TONIC_DART_LIBRARY_LOADER_H_