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We are adjusting these based on user feedback.  Many users found that
10 minutes was not enough time to complete common tasks which requried
assistance.  Based on usage data, 30 minutes should be enough for
the majority of sessions.  Also increasing the timeout for the
continue window to give the person being helped more time to find and
click the continue button.

Change-Id: I9a55568363e2bf79d6a82523c1a520364fbd3507
Reviewed-on: https://chromium-review.googlesource.com/1183539
Commit-Queue: Joe Downing <joedow@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587672}