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Add a browsertest to verify that we are not counting overhead
for responses with "Transfer-Encoding: chunked" towards network body
bytes. Rename PageLoadMetricsTestWaiter methods to use "network bytes"
instead of "resource bytes".

Bug: 894168
Change-Id: Id83af484f210063761dcbf4552406f08cdd5a171
Reviewed-on: https://chromium-review.googlesource.com/c/1351383Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Commit-Queue: John Delaney <johnidel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612322}