Revert "Dialog color tokens"

Revert submission 23729724-278574288

Reason for revert: Droidfood blocking bug b/289976570

Reverted changes: /q/submissionid:23729724-278574288
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:f43111c4144fa6473eaaf8e046178229be9d496b)
Merged-In: I28fa7cdd9a6d76d6074e70591565e336060e2fc4
Change-Id: I28fa7cdd9a6d76d6074e70591565e336060e2fc4