don't use TEST_P in RegionDataConstants tests

This cuts runtime from ~20 seconds on my machine to less than 1 second. In both cases, the vast majority of the time is spent spinning up the libaddressinput_unittests binary and launching tests, but since there is now 1 test instead of almost 1000 tests, performance improves.

Even running the tests with sharding, runtime reduces by approximately a factor of 4 on my machine (1.1s to .3s).

BUG=347399

Review URL: https://codereview.chromium.org/181483007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253949 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253949