GN: Add missing dependency for wm_unittests on ui_test_pak

ui/wm/BUILD.gn

Index: ui/wm/BUILD.gn
diff --git a/ui/wm/BUILD.gn b/ui/wm/BUILD.gn
index 80a5b657eaabfc324b86b258abe698856506aeb1..cc41f99e9628198b684f0777474723b1d495ada1 100644
--- a/ui/wm/BUILD.gn
+++ b/ui/wm/BUILD.gn
@@ -152,6 +152,7 @@ test("wm_unittests") {
   data = [
     "$root_out_dir/ui_test.pak",

[brettw, 2015/07/31 20:46:23]

It seems like this line should be unnecessary now.

[agrieve, 2015/08/05 00:43:40]

Done - is it always an error to list a file within $root_out_dir within the data
attribute?

[brettw, 2015/08/05 00:58:55]

No, but generally a data file should be listed once and a target should get it
by depending on the target that made it or is associated with it. In this case,
you get it by depending on ui_test_pak, so it should be listed there (however
best it is expressed for whatever type of file it is) and it shouldn't be listed
again in places like this.

   ]
+  data_deps = [ "//ui/resources:ui_test_pak" ]
 
   deps = [
     ":test_support",