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In the network service, no one sets the property. In content/browser,
some code read bytes into the property but no one uses the read content.

Bug: None
Change-Id: I16f347a1d70ca98aabf56fefc20c7423e6b52f30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526825Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826150}