Remove palette hooks.

Make the method be part of the official palette API.

Bug: 186016399
Bug: 185778652
Test: m
Change-Id: I3dc9e879c647fd63f5826091813613fd97e25c0d
Merged-In: I3dc9e879c647fd63f5826091813613fd97e25c0d
(cherry picked from commit 0ebaa9865b0d04f1b7b0ef13b5ed7e271b0ab588)
13 files changed