Use crMothershipRequestTileLayout() to get new tile layouts, fall back to a simple default algorithm if the user didn't setup a layout function. Remove some dead code.
Use crMothershipRequestTileLayout() to get new tile layouts, fall back to
a simple default algorithm if the user didn't setup a layout function.
Remove some dead code.

rpavlik/chromium,rpavlik/chromium,rpavlik/chromium,rpavlik/chromium,rpavlik/chromium