GitLab

Removed extra 'dependency' on target 'media_router_test_support'.

Also removed the ':' on some local dependencies.

Original patch: https://codereview.chromium.org/1136623003/
Original patch description:

- Refactor GYP and GN files to share source lists.
- Extract a proper test_support target.
- Fix upstream files with new target structure.

BUG=461815, 464199, 464205
TEST=Linux trybots. It's not clear to be exactly which bot, since
original patch failed after getting through trybots/CQ.

Review URL: https://codereview.chromium.org/1122393005

Cr-Commit-Position: refs/heads/master@{#330204}