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Changes in this patch:
-Created a IncognitoWindowTracker class, which contains methods to
notify the IPH server when events happen and if the help UI should be
triggered.
-Created a IncognitoWindowTrackerFactory class and registered in the
chrome browser main parts.
-Added unit tests for IncognitoWindowTracker event logging and expected
functionality.
-Take out event_on_history_deleted as we don't actually need to record
this.

Bug: 734248
Change-Id: Ib25154c50f952b9349884eb48eb58ef1d757a9bb
Reviewed-on: https://chromium-review.googlesource.com/666333
Commit-Queue: Bettina Dea <bdea@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502928}