Wait for just RECEIVED_PONG, which verifies that we have SENT_PING and got RECIVED_PONG.
Wait for just RECEIVED_PONG, which verifies that we have
SENT_PING and got RECIVED_PONG.

BUG=74949
TEST=ThreadWatcherTest (unit tests) on Linux
R=jar

Review URL: http://codereview.chromium.org/6627014

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@77053 0039d316-1c4b-4281-b951-d872f2087c98

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