Remove dead dependencies on xmllite and xmpp.

media/ and p2p/ doesn't actually depend on these anymore.

BUG=webrtc:5539
NOTRY=True

Review-Url: https://codereview.webrtc.org/2447533003
Cr-Commit-Position: refs/heads/master@{#14761}

webrtc/media/BUILD.gn

@@ -178,8 +178,6 @@ rtc_static_library("rtc_media") {
     "../api:call_api",
     "../base:rtc_base_approved",
     "../call",
-    "../libjingle/xmllite",
-    "../libjingle/xmpp",
     "../modules/video_coding",
     "../p2p",
     "../system_wrappers",

webrtc/p2p/BUILD.gn

@@ -83,7 +83,6 @@ rtc_static_library("rtc_p2p") {
 
   deps = [
     "../base:rtc_base",
-    "../libjingle/xmllite",
   ]
 
   if (rtc_build_expat) {