Remove unused variables in FullscreenDrawParams and PreviewPositionHelper

Flag: none
Test: FullscreenDrawParamsTest
Bug: 293224095
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:09407ebfbf50f949cce62135a3f4c1bf810af75f)
Merged-In: I978113003cc26d40d23b508935d18a2dd7913979
Change-Id: I978113003cc26d40d23b508935d18a2dd7913979
2 files changed