Revert back to using WaitUntil for page readyState until tests using WaitUntilNavigationCompletes() can be determined.
Revert back to using WaitUntil for page readyState until tests using
WaitUntilNavigationCompletes() can be determined.

TEST=none
BUG=124877
Review URL: https://chromiumcodereview.appspot.com/10217005

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@133751 0039d316-1c4b-4281-b951-d872f2087c98

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