Update EME browser_tests to handle early failure

Update EME browser_tests to handle early failure

encrypted_media_browsertest.cc checks receivedKeyMessage after the
test page completes. However, receivedKeyMessage is never set in
failure cases, so the code times out trying to get the value.
Setting receivedKeyMessage to false during initialization to avoid
this problem.

BUG=
TEST=manually created test failures cause EME browser_tests to fail

Committed: https://crrev.com/aacbf715042539a5a898fbda504af8faffd299b5
Cr-Commit-Position: refs/heads/master@{#322686}

[jrummell, 2015-03-27 23:05:30]

jrummell@chromium.org changed reviewers:
+ sandersd@chromium.org

[jrummell, 2015-03-27 23:05:30]

A simple change. PTAL.

[sandersd (OOO until July 31), 2015-03-27 23:17:54]

lgtm

[jrummell, 2015-03-27 23:22:20]

The CQ bit was checked by jrummell@chromium.org

[commit-bot: I haz the power, 2015-03-27 23:22:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1034343004/1

[commit-bot: I haz the power, 2015-03-28 00:29:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-28 00:30:39]

Patchset 1 (id:??) landed as
https://crrev.com/aacbf715042539a5a898fbda504af8faffd299b5
Cr-Commit-Position: refs/heads/master@{#322686}