Use "wildcard" instead of "unknown" for ADAPTER_TYPE_ANY in stats.

TBR=hta@webrtc.org

Bug: None
Change-Id: I3ccff01f2ad51aebc1241fab2b41518b769adc8a
Reviewed-on: https://webrtc-review.googlesource.com/90800
Commit-Queue: Qingsi Wang <qingsi@google.com>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24120}

rtc_base/network.cc

diff --git a/rtc_base/network.cc b/rtc_base/network.cc
index 0f42d6f..34da828 100644
--- a/rtc_base/network.cc
+++ b/rtc_base/network.cc
@@ -95,6 +95,7 @@
 std::string AdapterTypeToString(AdapterType type) {
   switch (type) {
     case ADAPTER_TYPE_ANY:
+      return "Wildcard";
     case ADAPTER_TYPE_UNKNOWN:
       return "Unknown";
     case ADAPTER_TYPE_ETHERNET: