Asynchronously resolve getAvailability callbacks.

content/renderer/presentation/presentation_dispatcher.cc

 // Copyright 2015 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 "content/renderer/presentation/presentation_dispatcher.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 237 matching lines @@
   auto status_it = availability_status_.find(availabilityUrl);
   if (status_it == availability_status_.end()) {
     status = new AvailabilityStatus(availabilityUrl);
     availability_status_[availabilityUrl] = base::WrapUnique(status);
   } else {
     status = status_it->second.get();
   }
   DCHECK(status);
 
   if (status->listening_state == ListeningState::ACTIVE) {
-    callbacks->onSuccess(status->last_known_availability);
-    delete callbacks;
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
+        FROM_HERE,
+        base::Bind(&blink::WebPresentationAvailabilityCallbacks::onSuccess,
+                   base::Owned(callbacks),
+                   status->last_known_availability));
     return;
   }
 
   status->availability_callbacks.Add(callbacks);
   UpdateListeningState(status);
 }
 
 void PresentationDispatcher::startListening(
     blink::WebPresentationAvailabilityObserver* observer) {
   auto status_it = availability_status_.find(observer->url());
@@ skipping 273 matching lines @@
 PresentationDispatcher::AvailabilityStatus::AvailabilityStatus(
     const GURL& availability_url)
     : url(availability_url),
       last_known_availability(false),
       listening_state(ListeningState::INACTIVE) {}
 
 PresentationDispatcher::AvailabilityStatus::~AvailabilityStatus() {
 }
 
 }  // namespace content