[roll third_party/pigweed] pw_metric: Removing references to Xooglers

Reassigning a TODO based on module OWNERS.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/112230

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: ab53e2a7115d5fc..15961aae7313137
Roller-URL: https://ci.chromium.org/b/8801834837023037201
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie24e1c94a5b80800bcfb000e02ff0b2624da09fa
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/112266
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index ab53e2a..15961aa 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit ab53e2a7115d5fcc13ee10a84a250eb294f70caf
+Subproject commit 15961aae731313750b69d1198a0ce03045e49212