cros: Add a header for gaia auth requests.

chrome/browser/resources/gaia_auth/manifest_test.json

Index: chrome/browser/resources/gaia_auth/manifest_test.json
diff --git a/chrome/browser/resources/gaia_auth/manifest_test.json b/chrome/browser/resources/gaia_auth/manifest_test.json
index 3b0363a48c207afe7767d43a98981270aabd7fc0..30a3d0f7de8862b8a1b3222e8bda6eaf8a860507 100644
--- a/chrome/browser/resources/gaia_auth/manifest_test.json
+++ b/chrome/browser/resources/gaia_auth/manifest_test.json
@@ -18,6 +18,9 @@
       "all_frames": true
     }
   ],
+  "background": {
+    "scripts": ["background.js"]
+  },
   "web_accessible_resources": [
     "main.css",
     "main.html",
@@ -31,10 +34,9 @@
     "test/content.js"
   ],
   "permissions": [
-      "https://insecure.com/*",
-      "https://www.google.com/accounts/*",
-      "https://accounts.google.com/*",
-      "https://gaiastaging.corp.google.com/*",
-      "chrome://oobe/"
+    "background",
+    "webRequest",
+    "webRequestBlocking",
+    "<all_urls>"
   ]
 }