[Bug 1012858]

[Pulsebot]

Pushed by mkmelin at iki.fi:
https://hg.mozilla.org/comm-central/rev/e0962bae9283
Emit stop sending event before prompt failure message to dismiss progress bar. r=mkmelin

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https://bugs.launchpad.net/bugs/1012858

Title:
  "Sending of message failed" dialog needs 100% of one CPU as long as it
  is open.

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