Factor out the fake port allocator in build.

Bug: None
Change-Id: I7d757ff33c87ec10c1d1699db36655e67f9e3e73
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/133764
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Jeroen de Borst <jeroendb@webrtc.org>
Commit-Queue: Qingsi Wang <qingsi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27723}
diff --git a/p2p/BUILD.gn b/p2p/BUILD.gn
index e7d2a61..5db66be 100644
--- a/p2p/BUILD.gn
+++ b/p2p/BUILD.gn
@@ -126,12 +126,23 @@
     ]
   }
 
+  rtc_source_set("fake_port_allocator") {
+    testonly = true
+    visibility = [ "*" ]
+    sources = [
+      "base/fake_port_allocator.h",
+    ]
+    deps = [
+      ":rtc_p2p",
+      "../rtc_base",
+    ]
+  }
+
   rtc_source_set("p2p_test_utils") {
     testonly = true
     sources = [
       "base/fake_dtls_transport.h",
       "base/fake_packet_transport.h",
-      "base/fake_port_allocator.h",
       "base/mock_async_resolver.h",
       "base/mock_ice_transport.h",
       "base/test_relay_server.h",
@@ -142,6 +153,7 @@
     ]
     deps = [
       ":fake_ice_transport",
+      ":fake_port_allocator",
       ":p2p_server_utils",
       ":rtc_p2p",
       "../api:libjingle_peerconnection_api",
@@ -186,6 +198,7 @@
     ]
     deps = [
       ":fake_ice_transport",
+      ":fake_port_allocator",
       ":p2p_server_utils",
       ":p2p_test_utils",
       ":rtc_p2p",