[tor-bugs] #28725 [Applications/Tor Browser]: Upgrade go-webrtc to dcbfc825aa33471253a5da1834d499257e05d557

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#28725: Upgrade go-webrtc to dcbfc825aa33471253a5da1834d499257e05d557
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     Reporter:  dcf                       |      Owner:  tbb-team
         Type:  task                      |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  snowflake tbb-rbm
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 The primary goal of this upgrade was to simplify by removing
 `-D_GLIBCXX_USE_CXX11_ABI=1`, which is [https://github.com/keroserene/go-
 webrtc/commit/a3140c36f9933013ad2e66bc21358a1bfea95a95 no longer required]
 in go-webrtc. The upgrade also required upgrades of the dependencies
 webrtc and depot_tools.

 I tested this with `make testbuild` and running the linux-x86_64 build. I
 haven't run the linux-i686 and osx-x86_64 builds.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28725>
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