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This CL starts to clean up the TabSwitcher interactions. It:

- removes unused methods from TabSwitcher
- Clarifies in MainController that the tab switcher is always the tab grid.
- Factors away the dismissTabSwitcherWithoutAnimationInModel: method in MainController, which was only called from one place.
- Removes a call to displayCurrentBVCAndFocusOmnibox: which was always a no-op for the tab grid.

Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Id911796f0e0d419da79aaf2181c7adca64f6c558
Reviewed-on: https://chromium-review.googlesource.com/c/1249088Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601587}