Add test specs for the experimental MSan bot.

BUG=178409
R=phajdan.jr@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/304353006

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@274247 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Build gtest for both 'host' and 'target'.

The (future) relocation packing tool requires a host build of gtest for
its unit tests.

BUG=

Review URL: https://codereview.chromium.org/308913002

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@274251 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Delete old mini_installer_test.

And run the new Python-driven test_mini_installer on win_rel trybot.

BUG=277655

Review URL: https://codereview.chromium.org/301223007

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@274260 4ff67af0-8c30-449e-8e8b-ad334ec8d88c