webnn: Update CFI ignores after delegate creation refactor

Delegate creation was moved from op_resolver.cc to graph_impl_tflite.cc
so the CFI ignores for calls into liboptimization_guide_internal.so
need to be updated.

Bug: 394119734
Change-Id: I8656d67bedc888042ac762848c216ea22eae9851
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6668976
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Peter Collingbourne <pcc@chromium.org>
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1478331}
NOKEYCHECK=True
GitOrigin-RevId: 46c88917c646fa9b465bad7e10256ad4f5844eb5