Add another MSan tester to chromium.fyi.

masters/master.chromium.fyi/master.cfg

Index: masters/master.chromium.fyi/master.cfg
diff --git a/masters/master.chromium.fyi/master.cfg b/masters/master.chromium.fyi/master.cfg
index 572802ca3a70743e7b39172aec7215a49b12748c..2c3cd205aaf799829dc0b2904578238974dedaef 100644
--- a/masters/master.chromium.fyi/master.cfg
+++ b/masters/master.chromium.fyi/master.cfg
@@ -1484,6 +1484,13 @@ b_chromium_rel_linux_msan = {
   'auto_reboot': True,
 }
 
+b_chromium_rel_linux_msan_browser = {
+  'name': 'Chromium Linux MSan (browser tests)',
+  'factory': annotator_factory.AnnotatorFactory().BaseFactory('chromium'),
+  'category': 'msan',
+  'auto_reboot': True,
+}
+
 b_chromium_rel_win32_morenacl = {
   'name': 'More NaCl Tests (win32)',
   'builddir': 'chromium-rel-win32-morenacl',
@@ -2155,6 +2162,7 @@ c['builders'] = [
 
   # MSan
   b_chromium_rel_linux_msan,
+  b_chromium_rel_linux_msan_browser,
 
   # NaCl
   b_chromium_rel_win32_morenacl,