Disable GN build on Vista-64.

buildbot/buildbot_selector.py

Index: buildbot/buildbot_selector.py
diff --git a/buildbot/buildbot_selector.py b/buildbot/buildbot_selector.py
index e1921c1b8f331a2beddba695108fabd54ce1eba4..fb5d1d6f1575e0e5fe7da2160458cd953063775c 100755
--- a/buildbot/buildbot_selector.py
+++ b/buildbot/buildbot_selector.py
@@ -265,6 +265,9 @@ for platform in [
     # Test with Breakpad tools only on basic Linux builds.
     if sys.platform.startswith('linux'):
       arch_flags += ' --use-breakpad-tools'
+    # GN executable can no longer run on Vista.
+    if platform == 'vista':
+      arch_flags += ' --no-gn'
     for mode in ['dbg', 'opt']:
       for libc in ['newlib', 'glibc']:
         # Buildbots.