Allow the background page to get an OAuth token for apps v1.

remoting/webapp/crd/js/oauth2_api.js

Index: remoting/webapp/crd/js/oauth2_api.js
diff --git a/remoting/webapp/crd/js/oauth2_api.js b/remoting/webapp/crd/js/oauth2_api.js
index 8c49efece6e6066c97017dff2995a3c5833b49fe..56fa44f3e7d2a5dd0b1c2cea77f56a38818551fb 100644
--- a/remoting/webapp/crd/js/oauth2_api.js
+++ b/remoting/webapp/crd/js/oauth2_api.js
@@ -74,8 +74,8 @@ remoting.OAuth2Api.refreshAccessToken = function(
   var onResponse = function(xhr) {
     if (xhr.status == 200) {
       try {
-        // Don't use jsonParseSafe here unless you move the definition out of
-        // remoting.js, otherwise this won't work from the OAuth trampoline.
+        // Don't use base.jsonParseSafe here unless you also include base.js,
+        // otherwise this won't work from the OAuth trampoline.
         // TODO(jamiewalch): Fix this once we're no longer using the trampoline.
         var tokens = JSON.parse(xhr.responseText);
         onDone(tokens['access_token'], tokens['expires_in']);
@@ -122,8 +122,8 @@ remoting.OAuth2Api.exchangeCodeForTokens = function(
   var onResponse = function(xhr) {
     if (xhr.status == 200) {
       try {
-        // Don't use jsonParseSafe here unless you move the definition out of
-        // remoting.js, otherwise this won't work from the OAuth trampoline.
+        // Don't use base.jsonParseSafe here unless you also include base.js,
+        // otherwise this won't work from the OAuth trampoline.
         // TODO(jamiewalch): Fix this once we're no longer using the trampoline.
         var tokens = JSON.parse(xhr.responseText);
         onDone(tokens['refresh_token'],