Convert most Chromium presubmit files to use new multiple-tryserver-compatible protocol

chrome/browser/ui/views/PRESUBMIT.py

Index: chrome/browser/ui/views/PRESUBMIT.py
diff --git a/chrome/browser/ui/views/PRESUBMIT.py b/chrome/browser/ui/views/PRESUBMIT.py
index e0c4e074812e86751f8193f23fd7705abf31421c..24df20c7767cbeedaf8eebe930237759ffb54d4e 100644
--- a/chrome/browser/ui/views/PRESUBMIT.py
+++ b/chrome/browser/ui/views/PRESUBMIT.py
@@ -8,5 +8,9 @@ See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details on the presubmit API built into gcl.
 """
 
-def GetPreferredTrySlaves():
-  return ['linux_chromeos']
+def GetPreferredTryMasters(project, change):
+  return {
+    'tryserver.chromium': {
+      'linux_chromeos': set(['defaulttests']),
+    }
+  }