GN: Update xmpp and p2p to match Chromium build

webrtc/p2p/p2p.gyp

Index: webrtc/p2p/p2p.gyp
diff --git a/webrtc/p2p/p2p.gyp b/webrtc/p2p/p2p.gyp
index 80b0076941d7348ae8dc6f73880c645e22c07fb4..8b3d73670b24db5ba6acfd27c6e025176894865a 100644
--- a/webrtc/p2p/p2p.gyp
+++ b/webrtc/p2p/p2p.gyp
@@ -23,6 +23,7 @@
         'base/basicpacketsocketfactory.h',
         'base/candidate.h',
         'base/common.h',
+        'base/dtlstransport.h',
         'base/dtlstransportchannel.cc',
         'base/dtlstransportchannel.h',
         'base/p2pconstants.cc',
@@ -41,8 +42,8 @@
         'base/pseudotcp.h',
         'base/relayport.cc',
         'base/relayport.h',
-        'base/relayserver.cc',
-        'base/relayserver.h',
+        'base/session.cc',
+        'base/session.h',
         'base/sessiondescription.cc',
         'base/sessiondescription.h',
         'base/sessionid.h',
@@ -52,8 +53,6 @@
         'base/stunport.h',
         'base/stunrequest.cc',
         'base/stunrequest.h',
-        'base/stunserver.cc',
-        'base/stunserver.h',
         'base/tcpport.cc',
         'base/tcpport.h',
         'base/transport.cc',
@@ -70,8 +69,6 @@
         'base/transportinfo.h',
         'base/turnport.cc',
         'base/turnport.h',
-        'base/turnserver.cc',
-        'base/turnserver.h',
         'base/udpport.h',
         'client/basicportallocator.cc',
         'client/basicportallocator.h',
@@ -87,6 +84,14 @@
       },
       'conditions': [
         ['build_with_chromium==0', {
+          'sources': [
+            'base/relayserver.cc',
+            'base/relayserver.h',
+            'base/stunserver.cc',
+            'base/stunserver.h',
+            'base/turnserver.cc',
+            'base/turnserver.h',
+          ],
           'defines': [
             'FEATURE_ENABLE_VOICEMAIL',
             'FEATURE_ENABLE_PSTN',