Move NetworkService mojom files to content/public/common.

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index c44a09eb3dca9575344e6fbf4ce4a3979a417718..0a63b0de433c3cbbb3000d9e6046b475ca2db99f 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -262,7 +262,7 @@ static_library("test_support") {
     "//content/gpu",
     "//content/public/browser",
     "//content/public/child",
-    "//content/public/common:interfaces",
+    "//content/public/common",
     "//content/public/common:service_names",
     "//content/public/renderer",
     "//content/public/utility",
@@ -350,9 +350,9 @@ static_library("test_support") {
     deps += [
       "//third_party/webrtc/api:libjingle_peerconnection",
       "//third_party/webrtc/api:rtc_stats_api",
-      "//third_party/webrtc/rtc_base:rtc_base_approved",
       "//third_party/webrtc/media:rtc_media_base",
       "//third_party/webrtc/modules/video_capture",
+      "//third_party/webrtc/rtc_base:rtc_base_approved",
       "//third_party/webrtc/stats:rtc_stats",
       "//third_party/webrtc_overrides:init_webrtc",
     ]
@@ -1699,10 +1699,10 @@ test("content_unittests") {
       "//third_party/webrtc/api:rtc_stats_api",
       "//third_party/webrtc/api:video_frame_api",
       "//third_party/webrtc/api/video_codecs:video_codecs_api",
-      "//third_party/webrtc/rtc_base:rtc_base",
       "//third_party/webrtc/media:rtc_media",
       "//third_party/webrtc/modules/desktop_capture:primitives",
       "//third_party/webrtc/modules/video_capture",
+      "//third_party/webrtc/rtc_base:rtc_base",
       "//third_party/webrtc/stats:rtc_stats_test_utils",
       "//third_party/webrtc_overrides:init_webrtc",
       "//ui/shell_dialogs:shell_dialogs",