Change DTLS default from 1.0 to 1.2 for webrtc.

This changes for standalone webrtc applications.

BUG=
R=pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1548733002 .

Cr-Commit-Position: refs/heads/master@{#11211}
diff --git a/talk/app/webrtc/peerconnectioninterface.h b/talk/app/webrtc/peerconnectioninterface.h
index 93f6241..b9afbad 100644
--- a/talk/app/webrtc/peerconnectioninterface.h
+++ b/talk/app/webrtc/peerconnectioninterface.h
@@ -502,13 +502,12 @@
  public:
   class Options {
    public:
-    Options() :
-      disable_encryption(false),
-      disable_sctp_data_channels(false),
-      disable_network_monitor(false),
-      network_ignore_mask(rtc::kDefaultNetworkIgnoreMask),
-      ssl_max_version(rtc::SSL_PROTOCOL_DTLS_10) {
-    }
+    Options()
+        : disable_encryption(false),
+          disable_sctp_data_channels(false),
+          disable_network_monitor(false),
+          network_ignore_mask(rtc::kDefaultNetworkIgnoreMask),
+          ssl_max_version(rtc::SSL_PROTOCOL_DTLS_12) {}
     bool disable_encryption;
     bool disable_sctp_data_channels;
     bool disable_network_monitor;