Make chromoting connect always work
Make chromoting connect always work

There was a race condition in the chromoting extension javascript. We wait
for OnUpdated() in order to send the chromoting tab a request for connection.
However OnUpdated() is insufficient for the chromoting tab is fully loaded.
And thus sending a request may not always work. This change will wait for the
tab to go to a "complete" status before a request is sent.

BUG=73202
TEST=Click on chromoting connect, it should always connect

Review URL: http://codereview.chromium.org/6532042

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@75341 0039d316-1c4b-4281-b951-d872f2087c98

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