[autoroll] Remove shaderc transitive dep from Dawn -> Skia roller
[autoroll] Remove shaderc transitive dep from Dawn -> Skia roller

shaderc dep was removed from Skia in https://skia-review.googlesource.com/c/skia/+/381236

Bug: dawn:706
Change-Id: I7af0f3e3b6ed268a5d2f2b3efd4bf59d62bd8622
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/381221
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot