Fix shouldOverrideUrlLoading related CTS test.

Make sure there is no shouldOverrideUrlLoading callback getting invoked after
the test is complete, by destroying the WebView when the test ends.

Also changed foo.com to example.com as the test site.

BUG: 28522255
Change-Id: Ie20e83afead8bdf0fb43e410255b86e68c304732
2 files changed