Revert "Script streaming: Add an option to make the main thread block (wait for parsing)"

Source/bindings/core/v8/ScriptStreamingMode.h

-// Copyright 2014 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 ScriptStreamingMode_h
-#define ScriptStreamingMode_h
-
-// ScriptStreamingModes are used for evaluating different heuristics for when we
-// should start streaming.
-
-namespace blink {
-
-enum ScriptStreamingMode {
-    // Stream all scripts
-    ScriptStreamingModeAll,
-    // Stream only async and deferred scripts
-    ScriptStreamingModeOnlyAsyncAndDefer,
-    // Stream all scripts, block the main thread after loading when streaming
-    // parser blocking scripts.
-    ScriptStreamingModeAllPlusBlockParsingBlocking
-};
-
-} // namespace blink
-
-#endif // ScriptStreamingMode_h