The "What is your project ID" has confused about every user of gsutil that I've
talked to, and isn't even useful in the context of download_from_google_storage
because its only good for "mb" on a bucket and "ls" without specifying a bucket,
neither of which this version of gsutil should ever do.

This CL:
* Removes the prompt for project ID
* Removes the 2 second delay which was meant for autolaunching a browser
  * We don't want this behavior anyways because most of our devs have multiple
    browser profiles open and they need to paste the URL into the correct profile.
* Removes support to autolaunch a broswer.
* Removes a lot of the extra messages.  The prompt now looks like:
===
$ download_from_google_storage -g
Please navigate your browser to the following URL:
https://accounts.google.com/o/oauth2/auth?.....

Enter the authorization code: <code>

Boto config file "/usr/local/google/home/hinoka/.boto.depot_tools" created.
$ 
===
BUG=351015

Review URL: https://codereview.chromium.org/222973002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@267973 0039d316-1c4b-4281-b951-d872f2087c98