Reland r169206 "Enable Woff 2.0 font compression format by default"

This feature was once enabled in M35 but we had to unlaunch it (wire
format changes being under consideration). The decoder patch for the
format change is landed [1], and we are not expecting further format
change at the moment.

[1] https://code.google.com/p/ots/source/detail?r=113

> Enable Woff 2.0 font compression format by default
>
> Feature Dashboard: http://www.chromestatus.com/features/6718644721549312
> PSA: https://groups.google.com/a/chromium.org/d/topic/chromium-dev/j27Ou4RtvQI/discussion
>
> BUG=242809, 223731
>
> Review URL: https://codereview.chromium.org/199773002

Review URL: https://codereview.chromium.org/265833004

git-svn-id: svn://svn.chromium.org/blink/trunk@173589 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in

@@ -145,7 +145,7 @@ WebAudio condition=WEB_AUDIO, status=stable
 WebGLDraftExtensions status=experimental
 WebMIDI status=test
 WebVTTRegions depends_on=Media, status=experimental
-WOFF2 status=experimental
+WOFF2 status=stable
 XSLT status=stable
 
 PseudoClassesInMatchingCriteriaInAuthorShadowTrees status=test