Chrome Version: ToT 70.0.3501.0
OS: All Blink OS

What steps will reproduce the problem?
(1) Do a clean compile
(2) Add a no-op to the constructor in core/streams/TransformStream.js, for example "no-op";
(3) Do an incremental build
(4) Run layout tests, ie. third_party/blink/tools/run_web_tests.py external/wpt/streams/transform-streams --no-ret
(5) rm *.bin in the build directory
(6) Do an incremental build again
(7) Run layout tests again

What is the expected result?

The results of steps (4) and steps (7) should be the same, ie. the tests pass both times.

What happens instead?

The tests fail at step (4) but pass at step (7).

Did this work before? Yes.