Fix most of the "gn check" errors in ui/*

ui/wm/BUILD.gn

Index: ui/wm/BUILD.gn
diff --git a/ui/wm/BUILD.gn b/ui/wm/BUILD.gn
index 5a976744e7b0d5324fa9d8d5bc9dd8a680113241..ec2da754f27b8d258ef78dc8373b2b967328e81d 100644
--- a/ui/wm/BUILD.gn
+++ b/ui/wm/BUILD.gn
@@ -96,18 +96,16 @@ static_library("test_support") {
   ]
 
   deps = [
+    ":wm",
     "//skia",
     "//ui/aura",
+    "//ui/aura:test_support",
     "//ui/base",
     "//ui/events",
     "//ui/events:events_base",
   ]
 }
 
-# TODO(GYP) enable the wm_unittests target when all dependencies have been
-# resolved. Some transitive deps aren't converted yet.
-if (false) {
-
 test("wm_unittests") {
   sources = [
     "test/run_all_unittests.cc",
@@ -141,7 +139,6 @@ test("wm_unittests") {
     "//ui/events/platform",
     "//ui/gfx",
     "//ui/gfx/geometry",
+    "//ui/gl",
   ]
 }
-
-}