[IndexedDB] Propogating changes to observers : Renderer

third_party/WebKit/Source/modules/indexeddb/WebIDBObserverImpl.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 "modules/indexeddb/WebIDBObserverImpl.h"
 
 #include "modules/indexeddb/IDBObserver.h"
 #include "wtf/PtrUtil.h"
 
 namespace blink {
 
 // static
 std::unique_ptr<WebIDBObserverImpl> WebIDBObserverImpl::create(IDBObserver* observer)
 {
     return wrapUnique(new WebIDBObserverImpl(observer));
 }
 
 WebIDBObserverImpl::WebIDBObserverImpl(IDBObserver* observer)
     : m_id(kInvalidObserverId)
     , m_observer(observer)
 {
 }
 
 // Remove observe call id from IDBObserver.
 WebIDBObserverImpl::~WebIDBObserverImpl()
 {
-    DCHECK_NE(kInvalidObserverId, m_id);
-    m_observer->removeObserver(m_id);
+    if (m_id != kInvalidObserverId)
+        m_observer->removeObserver(m_id);
 }
 
 void WebIDBObserverImpl::setId(int32_t id)
 {
     DCHECK_EQ(kInvalidObserverId, m_id);
     m_id = id;
 }
 
 } // namespace blink