The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/278b11efa32d7f219eeb0bb49c1bc8cb0d907a19

commit 278b11efa32d7f219eeb0bb49c1bc8cb0d907a19
Author: ryansturm <ryansturm@chromium.org>
Date: Sat Dec 17 02:57:21 2016

Show the Data Saver string for offline previews when Data Saver is enabled

When a user is a Data Saver user and is shown an offline preview,
they should be shown the Data Saver string (i.e., "Saved Data.").

When they are not a Data Saver user (i.e., Data Saver is disabled),
the string should remain as "Faster Page Loaded."

BUG= 674754 

Review-Url: https://codereview.chromium.org/2581533003
Cr-Commit-Position: refs/heads/master@{#439303}

[modify] https://crrev.com/278b11efa32d7f219eeb0bb49c1bc8cb0d907a19/chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_io_data.cc
[modify] https://crrev.com/278b11efa32d7f219eeb0bb49c1bc8cb0d907a19/chrome/browser/previews/previews_infobar_delegate.cc
[modify] https://crrev.com/278b11efa32d7f219eeb0bb49c1bc8cb0d907a19/chrome/browser/previews/previews_infobar_delegate.h
[modify] https://crrev.com/278b11efa32d7f219eeb0bb49c1bc8cb0d907a19/chrome/browser/previews/previews_infobar_delegate_unittest.cc
[modify] https://crrev.com/278b11efa32d7f219eeb0bb49c1bc8cb0d907a19/chrome/browser/previews/previews_infobar_tab_helper.cc