Remove fma call from Inliner tests.

In a followup CL (http://review.skia.org/564999), user code will be
forbidden from defining user functions on top of built-in functions.
We had some test code that inadvertently did this (unrelated to the
test in any meaningful way).

Change-Id: I8b70bf679e386b160ead29be423120d9999d3398
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/564998
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Arman Uguray <armansito@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Arman Uguray <armansito@google.com>
5 files changed