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This is the preparation to replace upload urls to resource ids.
After this CL, InitiateUploadXXX methods can be supported on Drive API v2.

BUG=148632
TEST=Ran unit_tests


Review URL: https://chromiumcodereview.appspot.com/12207075

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182356 0039d316-1c4b-4281-b951-d872f2087c98