Make mojo/application:test_support a group target.

mojo/services/html_viewer/BUILD.gn

Index: mojo/services/html_viewer/BUILD.gn
diff --git a/mojo/services/html_viewer/BUILD.gn b/mojo/services/html_viewer/BUILD.gn
index f5a5d43a8002f1b0f1c7fa810aaf9eb9b87c406a..a482055623e7be9caa27cf99d12493d48a8f5a74 100644
--- a/mojo/services/html_viewer/BUILD.gn
+++ b/mojo/services/html_viewer/BUILD.gn
@@ -230,13 +230,4 @@ mojo_native_application("apptests") {
     "//net:test_support",
     "//testing/gtest",
   ]
-
-  # TODO(msw): Move this to mojo/application:test_support; see crbug.com/477104.
-  data_deps = []
-  if (is_android) {
-    data_deps += [ "//mojo/android" ]
-  }
-  if (!is_component_build) {
-    data_deps += [ "//mojo/shell:mojo_shell" ]
-  }
 }