Globally disable extremely noisy Error Prone.

We noticed that of the 155240 warnings found, 73835+22742 (or about
62% of them) are coming from these two warnings:

* MissingOverride
* UnnecessaryParentheses

Since these aren't actually causing harm, they're mostly just
causing the build server to collect a bunch of unactionable
noise, so I'd like to proposal globally disabling those two
warnings.

Bug: 170172949
Test: manual
Change-Id: I453b12441f3b02b3854569bd032b6194265fbf6b
1 file changed