Make sure that xmpp targets depend on Chrome's rtc::TaskQueue impleme…

…ntation

Bug: none
Change-Id: Ie3adc12610b37a5021038664ab691c100e3fb652
Reviewed-on: https://chromium-review.googlesource.com/940224
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Tommi <tommi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539824}

third_party/libjingle_xmpp/BUILD.gn

@@ -49,11 +49,15 @@ rtc_static_library("rtc_xmllite") {
 
   deps = [
     "//third_party/webrtc/rtc_base:rtc_base",
+    "//third_party/webrtc_overrides:task_queue_impl",
   ]
   public_deps = [
     "//third_party/expat",
   ]
-  all_dependent_configs = [ ":libjingle_xmpp_common_config" ]
+  all_dependent_configs = [
+    ":libjingle_xmpp_common_config",
+    "//third_party/webrtc_overrides:jingle_unexported_configs",
+  ]
 }
 
 config("rtc_xmpp_warnings_config") {
@@ -101,6 +105,7 @@ rtc_static_library("rtc_xmpp") {
   deps = [
     ":rtc_xmllite",
     "//third_party/webrtc/rtc_base:rtc_base_approved",
+    "//third_party/webrtc_overrides:task_queue_impl",
   ]
   public_deps = [
     ":rtc_task_runner",