Remove Net.Port.Alpaca histogram

The Net.Port.Alpaca histogram is no longer needed. Remove it.

BUG=1323807

Change-Id: Ia9eef0b07394de4cd304bb5b78fed67ca99ff904
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3653802
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Commit-Queue: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1005684}
NOKEYCHECK=True
GitOrigin-RevId: b390bd148ec0cb1bd4fbf014ef05ac4d8745b0f0
1 file changed