Revert r189385 "Remove LifecycleContext" and r189391, r189530, r189456 that block it

Source/core/dom/ScopedWindowFocusAllowedIndicator.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 ScopedWindowFocusAllowedIndicator_h
 #define ScopedWindowFocusAllowedIndicator_h
 
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/ExecutionContext.h"
 #include "wtf/Noncopyable.h"
@@ skipping 13 matching lines @@
     }
 
 private:
     class Observer final : public NoBaseWillBeGarbageCollectedFinalized<Observer>, public ContextLifecycleObserver {
         WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(Observer);
     public:
         explicit Observer(ExecutionContext* executionContext)
             : ContextLifecycleObserver(executionContext)
         {
             if (executionContext)
-                executionContext->allowWindowInteraction();
+                executionContext->allowWindowFocus();
         }
 
         void dispose()
         {
             if (executionContext())
-                executionContext()->consumeWindowInteraction();
+                executionContext()->consumeWindowFocus();
         }
 
         void trace(Visitor* visitor)
         {
             ContextLifecycleObserver::trace(visitor);
         }
     };
 
     // In Oilpan, destructors are not allowed to touch other on-heap objects.
     // The Observer indirection is needed to keep
     // ScopedWindowFocusAllowedIndicator off-heap and thus allows its destructor
-    // to call executionContext()->consumeWindowInteraction().
+    // to call executionContext()->consumeWindowFocus().
     OwnPtrWillBePersistent<Observer> m_observer;
 };
 
 } // namespace blink
 
 #endif // ScopedWindowFocusAllowedIndicator_h