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To implement the FeatureEngagementTracker for a New Tab feature,
code was added to include a kIPHNewTabFeature. This feature will
only be included in Windows.

Bug: 734176
Change-Id: I85764c5dd6373c0bfcda0bb4fe0fad1af5b1f02d
Reviewed-on: https://chromium-review.googlesource.com/538815
Commit-Queue: Catherine Chung <catherinechung@google.com>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#480849}