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This is a reland of r138168, which was reverted speculatively, but identified unrelated.

When uploading a file with http authentication, UploadData is reused
for a new UploadDataStream. Hence, we should close the files in UploadData
if already opened and read, so we can reread the files from the beginning.

The regression was caused by r123677.  Special thanks to thomas.themel for
identifying the offending patch and helping us to fix the issue.

BUG=128574
TEST=added a unit test; manually confirmed that uploading a file with basic authentication, and multi-round authentication with NTLM and Negotiate worked.

Review URL: https://chromiumcodereview.appspot.com/10408042

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138191 0039d316-1c4b-4281-b951-d872f2087c98