Comment 4 for bug 1486535

> Seems to be a regression, but not a regression in Mir. The code that was removed has been there for what looks like years. So the emulator itself has somehow regressed.

There are two parts to the failure:

1. The display configuration reported by Mir is incorrect, which is clearly a Mir problem. The MP fixed this.
2. Failure to find a proper EGL config when EGL_COLOR_BUFFER_TYPE is specified, which is indeed an emulator bug. The MP provides a harmless workaround in Mir (i.e. EGL_RGB_BUFFER is the default, so we don't need to explicitly specify it) to unblock OTA6.