Added support for multiple parameters to Extension API callbacks.

chrome/browser/extensions/extension_debugger_api.cc

Index: chrome/browser/extensions/extension_debugger_api.cc
diff --git a/chrome/browser/extensions/extension_debugger_api.cc b/chrome/browser/extensions/extension_debugger_api.cc
index 6e59f22468537a0c1e9de7be9bb4d855dd174f7b..8f172f67da1e3a6ed60fb9b4af357dde641d5021 100644
--- a/chrome/browser/extensions/extension_debugger_api.cc
+++ b/chrome/browser/extensions/extension_debugger_api.cc
@@ -485,8 +485,8 @@ void SendCommandDebuggerFunction::SendResponseBody(
 
   Value* result_body;
   if (dictionary->Get("result", &result_body))
-    result_.reset(result_body->DeepCopy());
+    SetSingleResult(result_body->DeepCopy());
   else
-    result_.reset(new DictionaryValue());
+    SetSingleResult(new DictionaryValue());
   SendResponse(true);
 }