Stop async spellchecker before running the leak detector.

third_party/WebKit/Source/core/editing/spellcheck/SpellCheckRequester.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 208 matching lines @@
 
     invokeRequest(request);
 }
 
 void SpellCheckRequester::cancelCheck()
 {
     if (m_processingRequest)
         m_processingRequest->didCancel();
 }
 
+void SpellCheckRequester::prepareForLeakDetection()
+{
+    m_timerToProcessQueuedRequest.stop();
+    // Empty the queue of pending requests to prevent it being a leak source.
+    // Pending spell checker requests are cancellable requests not representing
+    // leaks, just async work items waiting to be processed.
+    //
+    // Rather than somehow wait for this async queue to drain before running
+    // the leak detector, they're all cancelled to prevent flaky leaks being
+    // reported.
+    m_requestQueue.clear();
+}
+
 void SpellCheckRequester::invokeRequest(PassRefPtrWillBeRawPtr<SpellCheckRequest> request)
 {
     ASSERT(!m_processingRequest);
     m_processingRequest = request;
     client().requestCheckingOfString(m_processingRequest);
 }
 
 void SpellCheckRequester::clearProcessingRequest()
 {
     if (!m_processingRequest)
@@ skipping 72 matching lines @@
 }
 
 DEFINE_TRACE(SpellCheckRequester)
 {
     visitor->trace(m_frame);
     visitor->trace(m_processingRequest);
     visitor->trace(m_requestQueue);
 }
 
 } // namespace blink