Remove now obsolete execinfo patch which botched the build if applied.
Update to 38.0.2125.58
Fix patching
ui_unittests are really gone.
Disable browser_tests and unit_tests for now, they require unavailable mock4js
Fix when TESTS are on, this file does not make sense on FreeBSD.
Disable GPU information collection on BSD, it uses Linuxy interfaces.
This should work, but it doesn't without the big hammer.
Back to internal libvpx because Chromium uses unreleased features of it.