Revert^2 "OpenJDK 11: Add String.repeat()"

This reverts commit 48fb9f43a81fa0cab09ed4a4f3d478c1a0ecbe9e.

Reason for revert: d8 has adopted the same behaviour as the intended
implementation so tests should no longer fail when backports are
applied.

Bug: 191859202
Bug: 202962059
Test: Treehugger
Test: cherry-pick to problem branch and run tests there.
Change-Id: I734673a2c37d04e77a76496a722db1460eaf2b49
5 files changed