Loading: remove unused MockThreadableLoader

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>;
-  }
-
-  MOCK_METHOD1(start, void(const ResourceRequest&));
-  MOCK_METHOD1(overrideTimeout, void(unsigned long));
-  MOCK_METHOD0(cancel, void());
-
- protected:
-  MockThreadableLoader() = default;
-};
-
-}  // namespace blink
-
-#endif  // MockThreadableLoader_h