Avoid a possible race between entry deletion and a command, in the event a...

chrome/browser/renderer_host/audio_renderer_host.cc

Index: chrome/browser/renderer_host/audio_renderer_host.cc
===================================================================
--- chrome/browser/renderer_host/audio_renderer_host.cc	(revision 70986)
+++ chrome/browser/renderer_host/audio_renderer_host.cc	(working copy)
@@ -460,7 +460,7 @@
 
   AudioEntryMap::iterator i = audio_entries_.find(
       AudioEntryId(route_id, stream_id));
-  if (i != audio_entries_.end())
+  if (i != audio_entries_.end() && !i->second->pending_close)
     return i->second;
   return NULL;
 }
@@ -473,7 +473,7 @@
   // TODO(hclam): Implement a faster look up method.
   for (AudioEntryMap::iterator i = audio_entries_.begin();
        i != audio_entries_.end(); ++i) {
-    if (controller == i->second->controller.get())
+    if (!i->second->pending_close && controller == i->second->controller.get())
       return i->second;
   }
   return NULL;