a49f515786181084cc487139bdd602d0f5900c62

Add download of MSan instrumented libraries similar to
the hook in https://codereview.chromium.org/1019573003.
Relevant changes:
* src/third_party/libvpx: 00cf1b1..2c87306
Details: da9a1c0..4d63ee8
/DEPS
Clang version was not updated in this roll.
R=earthdok@chromium.org
TBR=pbos@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/47769004
Cr-Commit-Position: refs/heads/master@{#8854}
Description
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