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 1bf4a9b9a13e10615d4379fe1f8e13d52d39f016..f37325033f8b167c4215f148aa67770f9b6b4f37 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -2255,6 +2255,14 @@ 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";