Remove TraceWrappers idl attribute
It turns out that we don't have to trace as much as expected, plus automation
cannot often be applied anyway. So let's just get rid of it and write traceWrapper
methods by hand.
LOG=no
BUG=
468240
Committed:
https://crrev.com/5ef4df517486edec05d4cca3e56c5eeedb11847a
Cr-Commit-Position: refs/heads/master@{#389864}