Move from sysmem.Allocator to sysmem2.Allocator.

[dustingreen]

b/306258175

[dustingreen]

This probably only makes sense to pull if this repo builds for fuchsia.

[kaidokert]

This probably only makes sense to pull if this repo builds for fuchsia.

Thanks for sending ! Sorry for long delay in response - fell between the cracks.

We don't build Fuchsia at all. We also want to keep this directory/component at the particular upstream version as close as possible, so our version moves become easy. It's currently tracking m114 code from Chromium.

[dustingreen]

understood; thanks!