Fix a potential assert in SpeechRecognizer dtor.

Fix a potential assert in SpeechRecognizer dtor.
When StopRecognition is invoked and no data was recorded, there is a possibility that the delegate
might release the recognizer within the DidCompleteRecognition callback. So we now perform cleanup
tasks such as freeing the encoder_ object before invoking the delegate. Without this change there
would be an assert in the SpeechRecognizer dtor about encoder_ remaining valid.

BUG=none
TEST=Manual, double-click on the speech button quickly a few times and verify no assert pops up in the dtor.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=71994

[hans, 2011-01-20 18:18:45]

On 2011/01/20 18:10:55, Satish wrote:

lgtm