Revert "Renaming TaskbarController to LauncherTaskbarUIController"

This reverts commit 40a742161938b343589e88e4b7f44b1cd67a69f1.

Reason for revert: DroidMonitor-triggered revert due to breakage https://android-build.googleplex.com/builds/tests/view?invocationId=I13700009003387451&testResultId=TR89423459137251402, bug https://buganizer.corp.google.com/issues/188755902

Bug: 188755902
Change-Id: Icd1ddd43e62d392f6b68b0150a1075f73106391a
7 files changed