Fix isolate tests flakiness because of test_data/chrome/browser/resources/print_preview.

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index 81007dd446f8f846e14f0c68eb4b73db121201c0..eb6e7e9acb6a5d7a546ae9956c9fed249de88880 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -3677,13 +3677,12 @@ test("unit_tests") {
 
     if (include_js_tests) {
       deps += [ "//chrome/test/data/webui:unit_tests_js" ]
+      data += [
+        "$root_out_dir/test_data/chrome/browser/resources/print_preview/",
+        "$root_out_dir/test_data/chrome/renderer/resources/extensions/",
+        "$root_out_dir/test_data/ui/webui/",
+      ]
     }
-
-    data += [
-      "$root_out_dir/test_data/chrome/browser/resources/print_preview/",
-      "$root_out_dir/test_data/chrome/renderer/resources/extensions/",
-      "$root_out_dir/test_data/ui/webui/",
-    ]
   }
 
   if (is_desktop_linux && enable_native_notifications) {