Fix views_mus_unittests dependency on views test support

Bug: 878384
Change-Id: I9105fbf1d4dcd52037b2ab6a56a42f5c7124c380
Reviewed-on: https://chromium-review.googlesource.com/1194026Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Tomasz Moniuszko <tmoniuszko@opera.com>
Cr-Commit-Position: refs/heads/master@{#587486}

ui/views/BUILD.gn

@@ -1016,7 +1016,7 @@ source_set("views_unittests_sources") {
   # Make all deps in this target public so both views_unittests and
   # views_mus_unittests will get them.
   public_deps = [
-    ":test_support",
+    ":test_support_internal",
     ":views",
     "//base",
     "//base:i18n",
@@ -1160,6 +1160,7 @@ test("views_unittests") {
   }
 
   deps = [
+    ":test_support",
     ":views_unittests_sources",
     "//mojo/core/embedder",
   ]