Add getGlobalPolicy to networkingPrivate API.

chrome/test/data/extensions/api_test/networking_private/test.js

Index: chrome/test/data/extensions/api_test/networking_private/test.js
diff --git a/chrome/test/data/extensions/api_test/networking_private/test.js b/chrome/test/data/extensions/api_test/networking_private/test.js
index aa2380b7185ba6d661a6fb5b2e42952893368c79..3ca9ca05dc8f199416d5a36d9d0f5ce528016c02 100644
--- a/chrome/test/data/extensions/api_test/networking_private/test.js
+++ b/chrome/test/data/extensions/api_test/networking_private/test.js
@@ -127,6 +127,9 @@ var availableTests = [
     chrome.networkingPrivate.setCellularSimState(
         kGuid, simState, callbackPass(callbackResult));
   },
+  function getGlobalPolicy() {
+    chrome.networkingPrivate.getGlobalPolicy(callbackPass(callbackResult));
+  }
 ];
 
 var testToRun = window.location.search.substring(1);