DevTools: remove V8DebuggerListener and ScriptDebuggerBase abstractions.

third_party/WebKit/Source/core/inspector/ScriptDebuggerBase.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 ScriptDebuggerBase_h
-#define ScriptDebuggerBase_h
-
-#include "core/CoreExport.h"
-#include "core/inspector/v8/V8Debugger.h"
-#include "core/inspector/v8/V8DebuggerClient.h"
-
-namespace blink {
-
-class CORE_EXPORT ScriptDebuggerBase : public V8DebuggerClient {
-    WTF_MAKE_NONCOPYABLE(ScriptDebuggerBase);
-public:
-    ScriptDebuggerBase(v8::Isolate*);
-    ~ScriptDebuggerBase() override;
-    v8::Local<v8::Object> compileDebuggerScript() override;
-    V8Debugger* debugger() const { return m_debugger.get(); }
-
-private:
-    v8::Isolate* m_isolate;
-    OwnPtr<V8Debugger> m_debugger;
-};
-
-} // namespace blink
-
-
-#endif // !defined(ScriptDebuggerBase_h)