Changed identity API to use promises instead of callbacks.

remoting/webapp/unittests/it2me_helpee_channel_unittest.js

Index: remoting/webapp/unittests/it2me_helpee_channel_unittest.js
diff --git a/remoting/webapp/unittests/it2me_helpee_channel_unittest.js b/remoting/webapp/unittests/it2me_helpee_channel_unittest.js
index 9c66b49f9b47f10ed528943f0bfd12bae1e80825..85bee2bbeb79d8fcefc70013ae4d7d4228ef2a5e 100644
--- a/remoting/webapp/unittests/it2me_helpee_channel_unittest.js
+++ b/remoting/webapp/unittests/it2me_helpee_channel_unittest.js
@@ -128,10 +128,10 @@ QUnit.asyncTest('connect() should return access code',
   });
   sinon.stub(chrome.identity, 'getAuthToken')
       .callsArgWith(1, 'token');
-  sinon.stub(remoting.identity, 'callWithToken')
-      .callsArgWith(0, 'token');
+  sinon.stub(remoting.identity, 'getToken')
+      .returns(Promise.resolve('token'));
   sinon.stub(remoting.identity, 'getEmail')
-      .callsArgWith(0, {token: 'token', email: 'test@chromium.org'});
+      .returns(Promise.resolve('test@chromium.org'));
   // Stubs Host behavior.
   sinon.stub(host, 'initialized').returns(true);
   sinon.stub(host, 'connect')