Added support for multiple parameters to Extension API callbacks.

chrome/browser/extensions/api/declarative/declarative_api.cc

Index: chrome/browser/extensions/api/declarative/declarative_api.cc
diff --git a/chrome/browser/extensions/api/declarative/declarative_api.cc b/chrome/browser/extensions/api/declarative/declarative_api.cc
index 3606972f4ca1dc4652a3c76f6cfdfb0c2db2cc13..489ce3d67fb3e658735dbfbaef61e42317376408 100644
--- a/chrome/browser/extensions/api/declarative/declarative_api.cc
+++ b/chrome/browser/extensions/api/declarative/declarative_api.cc
@@ -78,7 +78,7 @@ bool AddRulesFunction::RunImplOnCorrectThread() {
   error_ = rules_registry_->AddRules(extension_id(), params->rules);
 
   if (error_.empty())
-    result_.reset(AddRules::Result::Create(params->rules));
+    SetSingleResult(AddRules::Result::Create(params->rules));
 
   return error_.empty();
 }
@@ -111,7 +111,7 @@ bool GetRulesFunction::RunImplOnCorrectThread() {
   }
 
   if (error_.empty())
-    result_.reset(GetRules::Result::Create(rules));
+    SetSingleResult(GetRules::Result::Create(rules));
 
   return error_.empty();
 }