Make WebSpellCheckClient aware of leak detection

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 211 matching lines @@
 {
     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();
+    // WebSpellCheckClient stores a set of WebTextCheckingCompletion objects,
+    // which may store references to already invoked requests. We should clear
+    // these references to prevent them from being a leak source.
+    client().cancelAllPendingRequests();
 }
 
 void SpellCheckRequester::invokeRequest(SpellCheckRequest* request)
 {
     DCHECK(!m_processingRequest);
     LOG(INFO) << "SpellCheckRequester::invokeRequest #" << request->data().sequence();
     m_processingRequest = request;
     client().requestCheckingOfString(m_processingRequest);
 }
 
@@ skipping 80 matching lines @@
 }
 
 DEFINE_TRACE(SpellCheckRequester)
 {
     visitor->trace(m_frame);
     visitor->trace(m_processingRequest);
     visitor->trace(m_requestQueue);
 }
 
 } // namespace blink