Remove third_party/libjingle and update GN targets.

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index cc9b1f86ec79b9de54ae2968de9cdb9ae1d41c1e..38e7e190aac05ff4dfa68b6c9879f12e6d126e41 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -328,13 +328,13 @@ static_library("test_support") {
     ]
 
     deps += [
-      "//third_party/libjingle/webrtc:libjingle_webrtc",
       "//third_party/webrtc/api:libjingle_peerconnection",
       "//third_party/webrtc/api:rtc_stats_api",
       "//third_party/webrtc/base:rtc_base",
       "//third_party/webrtc/media:rtc_media_base",
       "//third_party/webrtc/modules/video_capture",
       "//third_party/webrtc/stats:rtc_stats",
+      "//third_party/webrtc_overrides:init_webrtc",
     ]
   }
 
@@ -1505,8 +1505,8 @@ test("content_unittests") {
     "//third_party/WebKit/public:blink",
     "//third_party/icu",
     "//third_party/leveldatabase",
-    "//third_party/libjingle",
     "//third_party/re2",
+    "//third_party/webrtc_overrides",
     "//third_party/widevine/cdm:headers",
     "//ui/accessibility",
     "//ui/base:test_support",
@@ -1616,7 +1616,6 @@ test("content_unittests") {
       "//third_party/webrtc/base/task_queue_unittest.cc",
     ]
     deps += [
-      "//third_party/libjingle/webrtc:libjingle_webrtc",
       "//third_party/opus",
       "//third_party/webrtc/api:libjingle_peerconnection",
       "//third_party/webrtc/api:rtc_stats_api",
@@ -1625,6 +1624,7 @@ test("content_unittests") {
       "//third_party/webrtc/modules/desktop_capture:primitives",
       "//third_party/webrtc/modules/video_capture",
       "//third_party/webrtc/stats:rtc_stats_test_utils",
+      "//third_party/webrtc_overrides:init_webrtc",
       "//ui/shell_dialogs:shell_dialogs",
     ]