* chore: bump chromium to 74.0.3729.5 (master)
* Remove ScopedBlockingCall constructor without location
1496560
* Use XCode 9.4.1 for Mac SDK 10.13
* chore: roll chromium 74.0.3729.27
In the GN build, libchromiumcontent is no longer a distinct library, but
merely a container for a set of scripts and patches. Maintaining those
patches in a separate repository is tedious and error-prone, so merge
them into the main repo.
Once this is merged and GN is the default way to build Electron, the
libchromiumcontent repository can be archived.
