Use detailed raw HTTP status code for UMA.
Use detailed raw HTTP status code for UMA.

BatchUpload implementation returns abstracted DRIVE_OTHER_ERROR to the
client code if we got bad HTTP status code. However for UMA, we would
like to know detaild raw HTTP status code.

BUG=537516
TEST=None

Review URL: https://codereview.chromium.org/1379763002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#351515}

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