Make sure pages that are closing but not yet closed are still suspended.

third_party/WebKit/Source/core/frame/DOMWindow.cpp

 // 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 "core/frame/DOMWindow.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/dom/SecurityContext.h"
@@ skipping 378 matching lines @@
     }
     return;
   }
 
   if (!frame()->shouldClose())
     return;
 
   InspectorInstrumentation::NativeBreakpoint nativeBreakpoint(context, "close",
                                                               true);
 
-  page->chromeClient().closeWindowSoon();
+  page->closeSoon();
 
   // So as to make window.closed return the expected result
   // after window.close(), separately record the to-be-closed
   // state of this window. Scripts may access window.closed
   // before the deferred close operation has gone ahead.
   m_windowIsClosing = true;
 }
 
 void DOMWindow::focus(ExecutionContext* context) {
   if (!frame())
@@ skipping 20 matching lines @@
 
   page->focusController().focusDocumentView(frame(), true /* notifyEmbedder */);
 }
 
 DEFINE_TRACE(DOMWindow) {
   visitor->trace(m_location);
   EventTargetWithInlineData::trace(visitor);
 }
 
 }  // namespace blink