Client's authClient not being used by request

[bryanburgers]

When an AuthClient is set on a Client using client.withAuthClient(oauth2client), that AuthClient is not used when making a request.

Example

Assuming I have a valid oauth2client and a valid client

// Or something like this
var oauth2client = getAuthClient();
var client = createAndDiscoverClient();

The following works:

client.analytics.management.profiles.list(data)
  .withAuthClient(oauth2client)
  .execute(function (err, result) {
    // Gets the result that I want
  });

I expect the following to work, but it does not. It returns with an error saying that authentication is needed.

client = client.withAuthClient(oauth2client);

client.analytics.management.profiles.list(data)
  .execute(function (err, result) {
    // Gets a not authenticated error
  });

The following works, proving that the authClient is getting set on the client, but it's just not making its way down to the request.

client = client.withAuthClient(oauth2client);

client.analytics.management.profiles.list(data)
  .withAuthClient(client.authClient)
  .execute(function (err, result) {
    // Gets the result that I want
  });

[rakyll]

If you'd like to have global authorization (mostly required for better experience with service accounts), you should set the AuthClient before discovery time.

googleapis.discover(...).withAuthClient(...).execute();

We're removing the public interfaces that allows you to authorize specific client instances.

[rakyll]

See #130.