Modify ProtocolHandlerRegistry to make room for policy

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 8ff0912b93b374e0b9a2d8fed3195e9996021eec..e7ffb0dd90a1ccd3759429cbb182e1e27a44a1c8 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -2257,6 +2257,14 @@ const char kRegisteredProtocolHandlers[] =
 const char kIgnoredProtocolHandlers[] =
   "custom_handlers.ignored_protocol_handlers";
 
+// List of protocol handlers registered by policy.
+const char kPolicyRegisteredProtocolHandlers[] =
+    "custom_handlers.policy.registered_protocol_handlers";
+
+// List of protocol handlers the policy has requested to be ignored.
+const char kPolicyIgnoredProtocolHandlers[] =
+    "custom_handlers.policy.ignored_protocol_handlers";
+
 // Whether user-specified handlers for protocols and content types can be
 // specified.
 const char kCustomHandlersEnabled[] = "custom_handlers.enabled";