Update HttpIceConfigRequest to call directory.

Previously HttpIceConfigRequest was calling Network Traversal API
The request was authenticated only with API key. Now it calls
Directory. Unlike Network Traversal API, Directory service requires
OAuth token.

Change-Id: I7efbc5ca83cef7c5a87cd3545fb2fea3598e9c3e
Reviewed-on: https://chromium-review.googlesource.com/529385
Commit-Queue: Sergey Ulanov <[email protected]>
Reviewed-by: Kelvin Poon <[email protected]>
Cr-Commit-Position: refs/heads/master@{#479148}
7 files changed