Workaround for the races when opening new tab with the chromoting extension.
Workaround for the races when opening new tab with the chromoting extension.

The problem is that the extension popup is often closed before it receives the
message that the tab has been opened, and thus never sends the message to the
new tab.

BUG=51194
TEST=tabs opened with the chromoting extension always connect

Review URL: http://codereview.chromium.org/3047058

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@55436 0039d316-1c4b-4281-b951-d872f2087c98

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