Include "sharedexclusivelock.cc" in Chromium GN build.

webrtc/base/BUILD.gn

 # Copyright (c) 2014 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/config/crypto.gni")
 import("//build/config/ui.gni")
@@ skipping 266 matching lines @@
     "ratetracker.cc",
     "ratetracker.h",
     "rtccertificate.cc",
     "rtccertificate.h",
     "scoped_autorelease_pool.h",
     "scoped_autorelease_pool.mm",
     "sha1.cc",
     "sha1.h",
     "sha1digest.cc",
     "sha1digest.h",
+    "sharedexclusivelock.cc",
+    "sharedexclusivelock.h",
     "signalthread.cc",
     "signalthread.h",
     "sigslot.cc",
     "sigslot.h",
     "sigslotrepeater.h",
     "socket.h",
     "socketadapters.cc",
     "socketadapters.h",
     "socketaddress.cc",
     "socketaddress.h",
@@ skipping 90 matching lines @@
       "optionsfile.cc",
       "optionsfile.h",
       "profiler.cc",
       "profiler.h",
       "proxyserver.cc",
       "proxyserver.h",
       "referencecountedsingletonfactory.h",
       "rollingaccumulator.h",
       "scopedptrcollection.h",
       "sec_buffer.h",
-      "sharedexclusivelock.cc",
-      "sharedexclusivelock.h",
       "sslconfig.h",
       "sslroots.h",
       "testclient.cc",
       "testclient.h",
       "transformadapter.cc",
       "transformadapter.h",
       "versionparsing.cc",
       "versionparsing.h",
       "virtualsocketserver.cc",
       "virtualsocketserver.h",
@@ skipping 233 matching lines @@
       "objc/RTCTracing.mm",
     ]
   }
 }
 
 source_set("gtest_prod") {
   sources = [
     "gtest_prod_util.h",
   ]
 }