Refactor extension event distribution to use Values instead of JSON strings.

chrome/browser/extensions/extension_menu_manager.cc

Index: chrome/browser/extensions/extension_menu_manager.cc
diff --git a/chrome/browser/extensions/extension_menu_manager.cc b/chrome/browser/extensions/extension_menu_manager.cc
index 48903fa19aeea6352164fbc24112a55d9644cdc4..2f7ff06fe2aabcce4aae45dd0dcea2fb3a1e5f4b 100644
--- a/chrome/browser/extensions/extension_menu_manager.cc
+++ b/chrome/browser/extensions/extension_menu_manager.cc
@@ -589,7 +589,7 @@ void ExtensionMenuManager::ExecuteCommand(
   if (item->type() == ExtensionMenuItem::RADIO)
     RadioItemSelected(item);
 
-  ListValue args;
+  ListValue* args = new ListValue();
 
   DictionaryValue* properties = new DictionaryValue();
   SetIdKeyValue(properties, "menuItemId", item->id());
@@ -619,14 +619,14 @@ void ExtensionMenuManager::ExecuteCommand(
 
   properties->SetBoolean("editable", params.is_editable);
 
-  args.Append(properties);
+  args->Append(properties);
 
   // Add the tab info to the argument list.
   // Note: web_contents only NULL in unit tests :(
   if (web_contents)
-    args.Append(ExtensionTabUtil::CreateTabValue(web_contents));
+    args->Append(ExtensionTabUtil::CreateTabValue(web_contents));
   else
-    args.Append(new DictionaryValue());
+    args->Append(new DictionaryValue());
 
   if (item->type() == ExtensionMenuItem::CHECKBOX ||
       item->type() == ExtensionMenuItem::RADIO) {
@@ -652,16 +652,12 @@ void ExtensionMenuManager::ExecuteCommand(
         GrantIfRequested(extension);
   }
 
-  std::string json_args;
-  base::JSONWriter::Write(&args, &json_args);
   event_router->DispatchEventToExtension(
       item->extension_id(), extension_event_names::kOnContextMenus,
-      json_args, profile, GURL(),
-      ExtensionEventRouter::USER_GESTURE_ENABLED);
+      args, profile, GURL(), ExtensionEventRouter::USER_GESTURE_ENABLED);
   event_router->DispatchEventToExtension(
       item->extension_id(), extension_event_names::kOnContextMenuClicked,
-      json_args, profile, GURL(),
-      ExtensionEventRouter::USER_GESTURE_ENABLED);
+      args, profile, GURL(), ExtensionEventRouter::USER_GESTURE_ENABLED);
 }
 
 void ExtensionMenuManager::SanitizeRadioList(