Revert "Fix BlurTests assumptions about insets"

This reverts commit 575eb58964ae23dda226aa45bbd44aab24de6016.

Reason for revert: DroidMonitor: Potential culprit for b/348668718 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:16a8f40fd3b3f3ef1b2f2243250a068021ee4499)
Merged-In: Idc6a44026f06265bcd87a3e8104a88f39bb2e57c
Change-Id: Idc6a44026f06265bcd87a3e8104a88f39bb2e57c