Remove IgnorableExceptionState

third_party/WebKit/Source/core/dom/IntersectionObserver.cpp

 // Copyright 2016 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/dom/IntersectionObserver.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/css/parser/CSSParserTokenRange.h"
 #include "core/css/parser/CSSTokenizer.h"
 #include "core/dom/Element.h"
@@ skipping 192 matching lines @@
   }
   if (root)
     root->ensureIntersectionObserverData().addObserver(*this);
   trackingDocument().ensureIntersectionObserverController().addTrackedObserver(
       *this);
 }
 
 void IntersectionObserver::clearWeakMembers(Visitor* visitor) {
   if (ThreadHeap::isHeapObjectAlive(root()))
     return;
-  IgnorableExceptionState exceptionState;
+  DummyExceptionStateForTesting exceptionState;
   disconnect(exceptionState);
   m_root = nullptr;
 }
 
 bool IntersectionObserver::rootIsValid() const {
   return rootIsImplicit() || root();
 }
 
 Document& IntersectionObserver::trackingDocument() const {
   Document* document = nullptr;
@@ skipping 183 matching lines @@
 
 DEFINE_TRACE(IntersectionObserver) {
   visitor->template registerWeakMembers<
       IntersectionObserver, &IntersectionObserver::clearWeakMembers>(this);
   visitor->trace(m_callback);
   visitor->trace(m_observations);
   visitor->trace(m_entries);
 }
 
 }  // namespace blink