Set include_js_tests to false in win/cross builds.

This will hopefully "fix" the following tests in cross builds (by no longer
running them) in interactive_ui_tests:

  ExtensionSettingsUIBrowserTest.ActivityLogInactiveWithoutSwitch
  ExtensionSettingsUIBrowserTest.ListenerRegistration
  ExtensionSettingsUIBrowserTest.ViewSource
  ExtensionsActivityLogTest.TestActivityLogVisible

See comment 6 on the bug.

If this helps, I'll try reverting #702844 which might then no longer be
necessary.

Bug: 1010561
Change-Id: Id31c4ea33493f6917d3a855d49cada56a032e9c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845801
Commit-Queue: Nico Weber <thakis@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703693}

chrome/test/BUILD.gn

@@ -42,7 +42,9 @@ if (is_android) {
   import("//chrome/android/features/dev_ui/dev_ui_module.gni")
   import("//tools/v8_context_snapshot/v8_context_snapshot.gni")
 } else {
-  include_js_tests = !(is_asan || is_msan || is_tsan)
+  # js_tests don't work in cross builds, https://crbug.com/1010561
+  include_js_tests =
+      !(is_asan || is_msan || is_tsan || (is_win && host_os != "win"))
 }
 
 # This target exists to reference other test executables to bring these files