Fix post submit build

https://ci.chromium.org/p/webrtc/g/ci/console

Change that broke them: https://webrtc-review.googlesource.com/c/src/+/120445/

Bug: None
Change-Id: I0ca59366e25d65ecc2ba359250a2a98b377cbfc8
Reviewed-on: https://webrtc-review.googlesource.com/c/120480
Reviewed-by: Qingsi Wang <qingsi@webrtc.org>
Reviewed-by: Seth Hampson <shampson@webrtc.org>
Commit-Queue: Peter Slatala <psla@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26457}

p2p/BUILD.gn

@@ -124,6 +124,7 @@ if (rtc_include_tests) {
       ":rtc_p2p",
       "../rtc_base:rtc_base",
       "../rtc_base:rtc_base_approved",
+      "//third_party/abseil-cpp/absl/algorithm:container",
       "//third_party/abseil-cpp/absl/types:optional",
     ]
   }