WebProcess::initializeWebProcess() can only enable font smoothing, never disable it - but it's enabled by default in WebCore. This manifests in sporadic font rendering related failures on WebKit tests, as the first test that runs after killing a frozen WebContent doesn't get font smoothing disabled.
Created attachment 334582 [details] proposed fix
Committed http://trac.webkit.org/r228982
<rdar://problem/37883871>