Fix Chrome Endure Docs test to wait until Docs loads (after a redirect).
Fix Chrome Endure Docs test to wait until Docs loads (after a redirect).

The test started failing consistently a few hours ago.  This change fixes
the problem.

BUG=None
TEST=Verified the Docs test starts properly on my local linux machine.


Review URL: http://codereview.chromium.org/9363065

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@122026 0039d316-1c4b-4281-b951-d872f2087c98

gavinp/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,ropik/chromium,adobe/chromium