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Previously we added a script write_ssargs.py to write .ssargs files for
SuperSize. To simplify things, this CL removes the script, and use GN
write_file() command instead.

As a result .ssargs files are created on "gn gen", instead of during
build.

Bug: 1040645
Change-Id: I147480817d1c3036780d5496cc30fd2d4c8b9fb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2267337
Commit-Queue: Samuel Huang <huangs@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782728}