Fix the consent loop in UploadsListFragment.

- Inside UploadsListFragment, the consent dialog is getting launched
automatically, without user intervention during onConnectionFailed.
After the consent dialog is launched, onStart gets triggered again
causing a subsequent connect/onConnectionFailed cycle.

- Use the same scopes throughout the application.
Merge pull request #1 from chirags/master

Fix the consent loop in UploadsListFragment.