Fix few targets in UI during GN build on Windows.

ui/base/BUILD.gn

Index: ui/base/BUILD.gn
diff --git a/ui/base/BUILD.gn b/ui/base/BUILD.gn
index 5a0e75a00d9cccb6495e64f46bce8637d9a19751..bf13973bca2f04ab6a634432d0c24484714926fe 100644
--- a/ui/base/BUILD.gn
+++ b/ui/base/BUILD.gn
@@ -826,6 +826,10 @@ if (!is_android) {
         "win/hwnd_subclass_unittest.cc",
         "win/open_file_name_win_unittest.cc",
       ]
+      sources -= [
+        "dragdrop/os_exchange_data_provider_aurax11_unittest.cc",

[tfarina, 2014/12/16 13:14:08]

Don't we have a filename filter for x11?

[Slava Chigrin, 2014/12/16 13:32:34]

As far as I understand, file name filter for GN is set up here
https://code.google.com/p/chromium/codesearch#chromium/src/build/config/BUILD...
, during sources_assignment_filter  setup. Seems, there are no filters, relevant
to x11 in file names. And comment there forbids adding more filters.

+        "x/selection_requestor_unittest.cc",
+      ]
 
       ldflags = [
         "/DELAYLOAD:d2d1.dll",