Do not build stun_prober within Chrome on gn.

webrtc/p2p/BUILD.gn

 # Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../build/webrtc.gni")
 
@@ skipping 145 matching lines @@
     # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 
   deps = [
     "..:webrtc_common",
     "../base:rtc_base",
   ]
 }
 
-executable("stun_prober") {
-  sources = [
-    "stunprober/main.cc",
-  ]
+if (!build_with_chromium) {
+  # Doesn't build within Chrome on Win.
 
-  configs += [ "..:common_config" ]
-  if (!build_with_chromium && is_clang) {
-    # Suppress warnings from Chrome's Clang plugins.
-    # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
-    configs -= [ "//build/config/clang:find_bad_constructs" ]
+  executable("stun_prober") {
+    sources = [
+      "stunprober/main.cc",
+    ]
+
+    configs += [ "..:common_config" ]
+    if (!build_with_chromium && is_clang) {
+      # Suppress warnings from Chrome's Clang plugins.
+      # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
+      configs -= [ "//build/config/clang:find_bad_constructs" ]
+    }
+
+    deps = [
+      ":libstunprober",
+      ":rtc_p2p",
+      "../system_wrappers:field_trial_default",
+    ]
   }
-
-  deps = [
-    ":libstunprober",
-    ":rtc_p2p",
-    "../system_wrappers:field_trial_default",
-  ]
 }