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As we add more fields into the proto, we'd like to monitor the network
usage of real time URL check.

Metrics added:
SafeBrowsing.RT.Request.Size

Bug: 1161342
Change-Id: I3bafe5bf7c8a2724d3c75adb2af869702a2db4be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617575Reviewed-by: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Xinghui Lu <xinghuilu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841672}