Show error messages in speech bubble allowing user to retry as well.

chrome/browser/speech/speech_recognizer.h

Index: chrome/browser/speech/speech_recognizer.h
diff --git a/chrome/browser/speech/speech_recognizer.h b/chrome/browser/speech/speech_recognizer.h
index 87ebb59144c207a93712c9fced6a76821c3d1b6c..4a18cb183903127c0376ca652d5c3bb387e614d5 100644
--- a/chrome/browser/speech/speech_recognizer.h
+++ b/chrome/browser/speech/speech_recognizer.h
@@ -51,8 +51,9 @@ class SpeechRecognizer
     virtual void DidCompleteRecognition(int caller_id) = 0;
 
     // Invoked if there was an error while recording or recognizing audio. The
-    // session is terminated when this call is made and the DidXxxx callbacks
-    // are issued after this call.
+    // session has already been cancelled when this call is made and the DidXxxx
+    // callbacks will not be issued. It is safe to destroy/release the
+    // |SpeechRecognizer| object while processing this call.
     virtual void OnRecognizerError(int caller_id,
                                    SpeechRecognizer::ErrorCode error) = 0;