GN: Make content_shell and webkit_unit_tests work in component build

jingle/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 
-jingle_includes = exec_script("//build/gypi_to_gn.py",
-                              [ rebase_path("jingle.gypi") ],
-                              "scope",
-                              [ "jingle.gypi" ])
+if (enable_webrtc || !is_android) {
+  jingle_includes = exec_script("//build/gypi_to_gn.py",
+                                [ rebase_path("jingle.gypi") ],
+                                "scope",
+                                [ "jingle.gypi" ])
 
-if (enable_webrtc || !is_android) {
   # GYP version: jingle/jingle.gyp:jingle_glue
   static_library("jingle_glue") {
     sources = jingle_includes.jingle_glue_sources
     deps = [
       "//base",
       "//base/third_party/dynamic_annotations",
       "//net",
       # '../third_party/libjingle/libjingle.gyp:libjingle',  # TODO(GYP)
     ]
     # 'export_dependent_settings': [
@@ skipping 169 matching lines @@
       "notifier/base/notifier_options.h",
     ]
     deps = [
       "//base",
       "//net"
     ]
   }
 
   source_set("notifier_test_util") { }
 }