Roll Skia from 7b46300fe4ff to 4202dc47a417 (3 revisions)

https://skia.googlesource.com/skia.git/+log/7b46300fe4ff..4202dc47a417

2020-09-01 johnstiles@google.com Use erase-remove idiom for dead-variable removal.
2020-09-01 johnstiles@google.com Use erase-remove idiom to remove dead SkSL functions.
2020-09-01 brianosman@google.com Make some internal runtime effect API private

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-autoroll
Please CC michaelludwig@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux-blink-rel;luci.chromium.try:linux-chromeos-compile-dbg;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Cq-Do-Not-Cancel-Tryjobs: true
Bug: None
Tbr: michaelludwig@google.com
Change-Id: I5bac484b6e64ff86138155e39ae1c63195179ffe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388241Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#803571}

DEPS

@@ -195,7 +195,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': '7b46300fe4ff4603c269093601e2779e36f71c88',
+  'skia_revision': '4202dc47a4178e749e1d54d58b5de96229b8082a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.