Add browserAction.enable/disable as alias for pageAction.show/hide.

chrome/browser/extensions/api/extension_action/extension_actions_api.cc

Index: chrome/browser/extensions/api/extension_action/extension_actions_api.cc
diff --git a/chrome/browser/extensions/api/extension_action/extension_actions_api.cc b/chrome/browser/extensions/api/extension_action/extension_actions_api.cc
index afc35db7e97c49448cb82c2dc5bf8443364e8389..4792737619d263421385199dc63ef87102cc40ec 100644
--- a/chrome/browser/extensions/api/extension_action/extension_actions_api.cc
+++ b/chrome/browser/extensions/api/extension_action/extension_actions_api.cc
@@ -91,6 +91,10 @@ bool ExtensionActionFunction::RunImpl() {
         break;
       }
 
+      case Value::TYPE_NULL:
+        // The tabId might be an optional argument.
+        break;
+
       default:
         EXTENSION_FUNCTION_VALIDATE(false);
     }