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The content-length related member variables occurring in a few classes
(SaveFileResourceHandler and SaveItem) is not used. Removing it. Also
now passing the correct content-description (it was always empty).
A few minor clean-ups as well.
This work is in preparation of changing that code to use the network
service.

Bug: 816644
Change-Id: I14f999fc3ce5b0bb77ecf9e1d35311ef7704db8a
Reviewed-on: https://chromium-review.googlesource.com/938386
Commit-Queue: Jay Civelli <jcivelli@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539919}