[third_party/pigweed] Roll 2 commits

1807af542686e6d pw_web: NPM version bump to 0.0.19
f3299bee142a088 pw_allocator: Remove conflict marker

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 46f6477f64d1411..1807af542686e6d
Roller-URL: https://ci.chromium.org/b/8749659682432794545
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I47dbd26895b7a84b899e16400daba231c08e5813
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/206610
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 46f6477..1807af5 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 46f6477f64d1411f920535f388368c5ca47dd46c
+Subproject commit 1807af542686e6dfe1dad3bb9c21d17d1c88a0da