[DevTools] Generate all files in inspector_protocol.

third_party/WebKit/Source/platform/inspector_protocol/BackendCallback.h

-// Copyright (c) 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 BackendCallback_h
-#define BackendCallback_h
-
-#include "platform/inspector_protocol/ErrorSupport.h"
-#include "platform/inspector_protocol/Platform.h"
-
-namespace blink {
-namespace protocol {
-
-class PLATFORM_EXPORT BackendCallback {
-public:
-    virtual ~BackendCallback() { }
-    virtual void sendFailure(const ErrorString&) = 0;
-};
-
-} // namespace platform
-} // namespace blink
-
-#endif // !defined(BackendCallback_h)