[tor-bugs] #16429 [Tor Browser]: Isolate mediasource and blob URLs in all contexts

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#16429: Isolate mediasource and blob URLs in all contexts
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     Reporter:  gk       |      Owner:  tbb-team
         Type:           |     Status:  needs_review
  enhancement            |  Milestone:
     Priority:  normal   |    Version:
    Component:  Tor      |   Keywords:  ff38-esr, tbb-linkability,
  Browser                |  TorBrowserTeam201507R, tbb-5.0a4
   Resolution:           |  Parent ID:
Actual Points:           |
       Points:           |
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Comment (by mcs):

 Kathy and I reviewed all of these changes and they look OK to us.  Just a
 few comments:
 * Are there cases where the isolation key will be "--ISOLATION-FAILED-"
 when it would be better to just fail?  For example, we could fail the
 creation of a blob URL if we cannot get an isolation key.
 * A nit: replace "isolationKey" with "aIsolationKey" in the
 nsHostObjectProtocolHandler::AddDataEntry() parameter list.
 * The messageSent variable is not really used inside
 dom/base/test/bug15703_page_retrieve.html; you could just remove it.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16429#comment:12>
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