Revert 186849 "Bind Window focus ability to the ExecutionContext..."

Source/modules/serviceworkers/WaitUntilObserver.cpp

Index: Source/modules/serviceworkers/WaitUntilObserver.cpp
===================================================================
--- Source/modules/serviceworkers/WaitUntilObserver.cpp	(revision 187183)
+++ Source/modules/serviceworkers/WaitUntilObserver.cpp	(working copy)
@@ -88,16 +88,6 @@
         return;
     }
 
-    if (!executionContext())
-        return;
-
-    // When handling a notificationclick event, we want to allow one window to
-    // be focused. Regardless of whether one window was focused,
-    // |consumeWindowFocus| will be called when all the pending activities will
-    // be resolved.
-    if (m_type == NotificationClick)
-        executionContext()->allowWindowFocus();
-
     incrementPendingActivity();
     ScriptPromise::cast(scriptState, value).then(
         ThenFunction::createFunction(scriptState, this, ThenFunction::Fulfilled),
@@ -144,7 +134,6 @@
         break;
     case NotificationClick:
         client->didHandleNotificationClickEvent(m_eventID, result);
-        executionContext()->consumeWindowFocus();
         break;
     case Push:
         client->didHandlePushEvent(m_eventID, result);