Cleaning up TODOs in //google_apis.

The build warning is no longer necessary as we now have an infobar
show up to warn developers if API keys haven't been set.

The Python API may never need to be better than it is today, so
removing the TODO there; it will be improved if and when needed.

The underlying reason for the inconsistent semantics between setting
the GOOGLE_DEFAULT_CLIENT_ID/SECRET environment variables and the
google_default_client_id/secret gyp variables is gone, so I fixed this
mismatch in the current change.

BUG=none

Review URL: https://chromiumcodereview.appspot.com/18851002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@210406 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed