Create export def file for Windows ARM64 platform.

The only difference between the new chrome_elf_arm64.def and existing chrome_elf_x64.def is that RegisterNonABICompliantCodeRange_ExportThunk and UnregisterNonABICompliantCodeRange_ExportThunk are not included because they are defined as x64 specific.

Bug: 893460
Change-Id: Id0d11fb9264309b3c6ce97d81eeab1a39e158fba
Reviewed-on: https://chromium-review.googlesource.com/c/1325149
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Cait Phillips <caitkp@chromium.org>
Commit-Queue: Tom Tan <Tom.Tan@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#608143}