Revert 136296 - Make all extension api types fully qualified.

chrome/common/extensions/api/tabs.json

Index: chrome/common/extensions/api/tabs.json
===================================================================
--- chrome/common/extensions/api/tabs.json	(revision 136322)
+++ chrome/common/extensions/api/tabs.json	(working copy)
@@ -86,7 +86,7 @@
           }
         ],
         "returns": {
-          "$ref": "extension.Port",
+          "$ref": "Port",
           "description": "A port that can be used to communicate with the content scripts running in the specified tab. The port's <a href='extension.html#type-Port'>onDisconnect</a> event is fired if the tab closes or does not exist. "
         }
       },
@@ -371,7 +371,7 @@
              "parameters": [
                {
                  "name": "window",
-                 "$ref": "windows.Window",
+                 "$ref": "Window",
                  "description": "Contains details about the window whose tabs were highlighted."
                }
              ]