Added support for multiple parameters to Extension API callbacks.

chrome/browser/extensions/extension_font_settings_api.cc

Index: chrome/browser/extensions/extension_font_settings_api.cc
diff --git a/chrome/browser/extensions/extension_font_settings_api.cc b/chrome/browser/extensions/extension_font_settings_api.cc
index f3bc3e40c78f2693a85eaa76cd2dd4dc77b3f601..d31c1699759aba63cd65fb373ccb161d2bbd1b17 100644
--- a/chrome/browser/extensions/extension_font_settings_api.cc
+++ b/chrome/browser/extensions/extension_font_settings_api.cc
@@ -293,7 +293,7 @@ bool GetFontFunction::RunImpl() {
   DictionaryValue* result = new DictionaryValue();
   result->SetString(kFontNameKey, font_name);
   result->SetString(kLevelOfControlKey, level_of_control);
-  result_.reset(result);
+  SetSingleResult(result);
   return true;
 }
 
@@ -360,7 +360,7 @@ bool GetFontListFunction::CopyFontsToResult(ListValue* fonts) {
     result->Append(font_name);
   }
 
-  result_.reset(result.release());
+  SetSingleResult(result.release());
   return true;
 }
 
@@ -395,7 +395,7 @@ bool GetFontPrefExtensionFunction::RunImpl() {
   DictionaryValue* result = new DictionaryValue();
   result->Set(GetKey(), pref->GetValue()->DeepCopy());
   result->SetString(kLevelOfControlKey, level_of_control);
-  result_.reset(result);
+  SetSingleResult(result);
   return true;
 }