Revert of Bind Window focus ability to the ExecutionContext instead of the process.

Source/core/dom/ScopedWindowFocusAllowedIndicator.cpp

Index: Source/core/dom/ScopedWindowFocusAllowedIndicator.cpp
diff --git a/Source/core/dom/ScopedWindowFocusAllowedIndicator.cpp b/Source/core/dom/ScopedWindowFocusAllowedIndicator.cpp
deleted file mode 100644
index 0df9db240bb13f456c3533d339509241ca88c233..0000000000000000000000000000000000000000
--- a/Source/core/dom/ScopedWindowFocusAllowedIndicator.cpp
+++ /dev/null
@@ -1,26 +0,0 @@
-// 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.
-
-#include "config.h"
-#include "core/dom/ScopedWindowFocusAllowedIndicator.h"
-
-#include "core/dom/ExecutionContext.h"
-
-namespace blink {
-
-ScopedWindowFocusAllowedIndicator::ScopedWindowFocusAllowedIndicator(
-    ExecutionContext* context)
-    : ContextLifecycleObserver(context)
-{
-    if (executionContext())
-        executionContext()->allowWindowFocus();
-}
-
-ScopedWindowFocusAllowedIndicator::~ScopedWindowFocusAllowedIndicator()
-{
-    if (executionContext())
-        executionContext()->consumeWindowFocus();
-}
-
-} // namespace blink