[Media Router] Reland of "Media Router GYP/GN cleanup".

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}

1 files changed, 1 insertions, 4 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 5153efe..65f40e0 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -169,10 +169,7 @@ group("both_gn_and_gyp") {
   }
 
   if (enable_media_router) {
-    deps += [
-      "//chrome/browser/media/router/",
-      "//chrome/browser/media/router:unit_tests",
-    ]
+    deps += [ "//chrome/browser/media/router" ]
   }
 
   if (enable_remoting) {