Fix GN compile of gn_all

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index d9e32d863edc45aa050342bf6b240d619f73efa8..f9cb0970e2c2a451709fc9c47f6248c0d8d44073 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -106,7 +106,6 @@ group("both_gn_and_gyp") {
       "//ipc/mojo:ipc_mojo_unittests",
       "//jingle:jingle_unittests",
       "//media:media_unittests",
-      "//media/cast:cast_unittests",
       "//media/midi:midi_unittests",
       "//mojo",
       "//mojo/application/public/cpp",
@@ -616,7 +615,10 @@ group("both_gn_and_gyp") {
       "//net:net_unittests",  # TODO(GYP)
     ]
   } else if (!is_android && !is_ios) {
-    deps += [ "//breakpad:symupload" ]
+    deps += [
+      "//breakpad:symupload",
+      "//media/cast:cast_unittests",
+    ]
   }
 }