Revert of [Bindings] Create and use V8 context snapshots

third_party/WebKit/public/web/WebV8ContextSnapshot.h

-// Copyright 2017 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 WebV8ContextSnapshot_h
-#define WebV8ContextSnapshot_h
-
-#include "public/platform/WebCommon.h"
-#include "v8/include/v8.h"
-
-namespace blink {
-
-// WebV8ContextSnapshot is an API to take a snapshot of V8 context.
-// This API should be used only by tools/v8_context_snapshot, which runs during
-// Chromium's build step.
-class BLINK_EXPORT WebV8ContextSnapshot {
- public:
-  static v8::StartupData TakeSnapshot();
-};
-
-}  // namespace blink
-
-#endif  // WebV8ContextSnapshot_h