Revert 112770 - Prevent a crash in the first run search engine selector.

Revert 112770 - Prevent a crash in the first run search engine selector.

It is possible to try and close the window now before the TemplateURLService is loaded. In this case we will not have a fallback search engine to select by default. So we will just reject attempts to close the window in this circumstance until it is loaded and a fallback choice has been set. It should be an edge case.

http://crbug.com/106078
TEST=unit test
Review URL: http://codereview.chromium.org/8771018

TBR=ben@chromium.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=112804