GitLab

71435 caused SpecialTabsTest.testSpecialURLTabs to fail, since that
was checking the title for about:sync.

Added more tests for about:sync-internals and chrome://sync-internals.

BUG=69733
TEST=SpecialTabsTest
TBR=nirnimesh

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71549 0039d316-1c4b-4281-b951-d872f2087c98