Revert "Clear all DragView in onSaveInstanceState"

This reverts commit 14d6771aae2037d5e9bb330f608c4a7e461786d3
to fix bootline regression.

Bug: 210383463
Test: manual
Change-Id: I5a0dadee59bfd6b5a164fd2ca3ecdd1885cb4134
2 files changed