Add IPv4/IPv6 counters to UMA even when count is 0.

content/renderer/p2p/ipc_network_manager.cc

Index: content/renderer/p2p/ipc_network_manager.cc
diff --git a/content/renderer/p2p/ipc_network_manager.cc b/content/renderer/p2p/ipc_network_manager.cc
index 9cf6cf5013efa3ef9a73c80ac6f387c6bcb40d79..d306787560715527a624897d18f9a7db70bcae51 100644
--- a/content/renderer/p2p/ipc_network_manager.cc
+++ b/content/renderer/p2p/ipc_network_manager.cc
@@ -105,15 +105,12 @@ void IpcNetworkManager::OnNetworkListChanged(
     }
   }
 
-  if (ipv4_interfaces > 0) {
-    UMA_HISTOGRAM_COUNTS_100("WebRTC.PeerConnection.IPv4Interfaces",
-                             ipv4_interfaces);
-  }
 
-  if (ipv6_interfaces > 0) {
-    UMA_HISTOGRAM_COUNTS_100("WebRTC.PeerConnection.IPv6Interfaces",
-                             ipv6_interfaces);
-  }
+  // Send interface counts to UMA.
+  UMA_HISTOGRAM_COUNTS_100("WebRTC.PeerConnection.IPv4Interfaces",
+                           ipv4_interfaces);
+  UMA_HISTOGRAM_COUNTS_100("WebRTC.PeerConnection.IPv6Interfaces",
+                           ipv6_interfaces);
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kAllowLoopbackInPeerConnection)) {