Crashing on exception: *** initialization method -initWithCharactersNoCopy:length:freeWhenDone: cannot be sent to an abstract object of class __NSCFConstantString: Create a concrete instance!

This gets called in https://cs.chromium.org/chromium/src/third_party/WebKit/Source/platform/fonts/mac/FontCacheMac.mm?type=cs&q=%22initWithCharactersNoCopy:%22&l=139.

See https://productforums.google.com/forum/#!topic/chrome/77B33Tal094. 

I wasn't able to find a corresponding crash in go/crash, but maybe I'm not searching for it correctly.