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Removes the infobar for "Please consider disabling chrome data saver"
and moved it into the console instead through the NetworkLog. We will
now sniff the headers looking for the chrome proxy and show the console
message only when we see the main resource was loaded with the proxy
header present.

see b/63351364 for new p-link request.

R=dgozman
BUG=455981

Change-Id: I08e4b200c20e7e650fefe3d047a8349e8cf2c169
Reviewed-on: https://chromium-review.googlesource.com/477598Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Blaise Bruer <allada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487385}