Reverts flutter/flutter#140462
Initiated by: cbracken
This change reverts the following previous change:
Original Description:
The test was flaky before due to overflowing GPU memory during the test. The memory leak was fixed here https://github.com/flutter/engine/pull/49214

Fixes https://github.com/flutter/flutter/issues/137669

As a side effect of the fix, this test also runs much faster, from about 3 minutes on my Macbook down to about 25 seconds.