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

jingle/PRESUBMIT.py

Index: jingle/PRESUBMIT.py
diff --git a/jingle/PRESUBMIT.py b/jingle/PRESUBMIT.py
index 1ed6464075e2f2c34fd656242c503dee8de14ed4..efbfc0c9d7bef6a3f3db7792c3c4bc5a35554665 100644
--- a/jingle/PRESUBMIT.py
+++ b/jingle/PRESUBMIT.py
@@ -8,9 +8,11 @@ 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_rel:sync_integration_tests',
-    'mac_rel:sync_integration_tests',
-    'win_rel:sync_integration_tests',
-  ]
+def GetPreferredTryMasters(project, change):
+  return {
+    'tryserver.chromium': {
+      'linux_rel': set(['sync_integration_tests']),
+      'mac_rel': set(['sync_integration_tests']),
+      'win_rel': set(['sync_integration_tests']),
+    }
+  }