Improves first run dialog performance on Win8

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index b62091b070f9590cd9fe5a3ed5e96239e2958114..9ba58d3842ba8574d0d65e9ca76411c6e69b9f38 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -1226,6 +1226,8 @@ if (!is_android) {
       deps += [ "//chrome/test/media_router:media_router_browsertests" ]
     }
     if (is_win) {
+      sources +=

[grt (UTC plus 2), 2016/07/19 08:13:01]

i think you can remove this if you move the file into
chrome_browser_tests_sources.

[zmin, 2016/07/20 16:35:45]

Done.

+          [ "../browser/ui/webui/set_as_default_browser_ui_browsertest_win.cc" ]
       deps += [
         "//chrome:other_version",
         "//third_party/wtl",