A function was renamed which broke the platformMethods table strings.
This CL reverts the rename (originally from crrev/c/1660952)

Bug: angleproject:1621
Change-Id: I8121a4956ba1d3e3c5036f72f6f1fdf5509dc491
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1664792Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>