Change unit_tests 'data' gn key to list files, not directories

Bug: 995737,912946
Change-Id: I1074c408436e3cffe33184176d924c7604d80bf4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762719Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688768}

chrome/test/BUILD.gn

@@ -3967,9 +3967,13 @@ test("unit_tests") {
 
     if (include_js_tests) {
       deps += [ "//chrome/test/data/webui:unit_tests_js" ]
+
+      # Only list files here (not directories). See https://crbug.com/912946
       data += [
-        "$root_out_dir/test_data/chrome/renderer/resources/extensions/",
-        "$root_out_dir/test_data/ui/webui/",
+        "$root_out_dir/test_data/chrome/renderer/resources/extensions/notifications_custom_bindings.gtestjs",
+        "$root_out_dir/test_data/chrome/renderer/resources/extensions/notifications_custom_bindings.js",
+        "$root_out_dir/test_data/chrome/renderer/resources/extensions/notifications_test_util.js",
+        "$root_out_dir/test_data/ui/webui/resources/js/cr.js",
       ]
     }
   }
@@ -4635,9 +4639,7 @@ test("unit_tests") {
   }
 
   if (enable_basic_printing) {
-    sources += [
-      "../browser/printing/print_job_unittest.cc",
-    ]
+    sources += [ "../browser/printing/print_job_unittest.cc" ]
 
     deps += [
       "//printing",