Revert of Move ThreadableLoader to Oilpan heap (2/3)

third_party/WebKit/Source/core/loader/MockThreadableLoader.h

 // Copyright 2016 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 MockThreadableLoader_h
 #define MockThreadableLoader_h
 
 #include "core/loader/ThreadableLoader.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "wtf/PtrUtil.h"
 #include <memory>
 
 namespace blink {
 
 class MockThreadableLoader : public ThreadableLoader {
 public:
-    static MockThreadableLoader* create() { return new testing::StrictMock<MockThreadableLoader>; }
+    static std::unique_ptr<MockThreadableLoader> create() { return wrapUnique(new testing::StrictMock<MockThreadableLoader>); }
 
     MOCK_METHOD1(start, void(const ResourceRequest&));
     MOCK_METHOD1(overrideTimeout, void(unsigned long));
     MOCK_METHOD0(cancel, void());
 
 protected:
     MockThreadableLoader() = default;
 };
 
 } // namespace blink
 
 #endif // MockThreadableLoader_h