GitLab

* Removed initial TabStrip* arg, no one was using it.
* Changed names from e.g. TabStripAddedTabAt() to OnTabAdded() to shorten and
  make consistent with other observer OnXXX() names.
* Changed TabStripMaxXChanged() to OnTabsMaxXChanged() in keeping with the
  meaning change in https://chromium-review.googlesource.com/c/chromium/src/+/1038789 .
* Changed override order in GlassBrowserFrameView to match base class.

BUG=none
TEST=none

Change-Id: Ibf29362d818d8f63e34c168d428173bca6e2a257
Reviewed-on: https://chromium-review.googlesource.com/1038796
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555514}