Have the authenticating_url_loader cache token per-origin.

R=blundell@chromium.org

Review URL: https://codereview.chromium.org/1161603003
diff --git a/services/authenticating_url_loader/BUILD.gn b/services/authenticating_url_loader/BUILD.gn
index 730270e..5dd07b7 100644
--- a/services/authenticating_url_loader/BUILD.gn
+++ b/services/authenticating_url_loader/BUILD.gn
@@ -25,5 +25,6 @@
     "//mojo/services/authenticating_url_loader/public/interfaces",
     "//mojo/services/authentication/public/interfaces",
     "//mojo/services/network/public/interfaces",
+    "//url",
   ]
 }