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A Profile* can be passed to the constructor of DriveProtocolHandler and
the handler uses the given Profile* for processing the request.
This will help us adding unittests and introducting support for multiple profiles.
If the handler is constructed without Profile*,  it will use the profile from
ProfileManager::GetDefaultProfile().

BUG=167249
TEST=unittests. try opening a URL of 'drive://' (e.g. HTML file stored in Google Drive) on Chrome OS.


Review URL: https://chromiumcodereview.appspot.com/11785018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@176062 0039d316-1c4b-4281-b951-d872f2087c98