Delete SignalThread class.

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 455 matching lines @@
     "physicalsocketserver.cc",
     "physicalsocketserver.h",
     "proxyinfo.cc",
     "proxyinfo.h",
     "ratelimiter.cc",
     "ratelimiter.h",
     "rtccertificate.cc",
     "rtccertificate.h",
     "rtccertificategenerator.cc",
     "rtccertificategenerator.h",
-    "signalthread.cc",
-    "signalthread.h",
     "sigslot.cc",
     "sigslot.h",
     "sigslotrepeater.h",
     "socket.h",
     "socketadapters.cc",
     "socketadapters.h",
     "socketaddress.cc",
     "socketaddress.h",
     "socketaddresspair.cc",
     "socketaddresspair.h",
@@ skipping 442 matching lines @@
       "nat_unittest.cc",
       "network_unittest.cc",
       "optionsfile_unittest.cc",
       "proxy_unittest.cc",
       "ptr_util_unittest.cc",
       "ratelimiter_unittest.cc",
       "rollingaccumulator_unittest.cc",
       "rtccertificate_unittest.cc",
       "rtccertificategenerator_unittest.cc",
       "sha1digest_unittest.cc",
-      "signalthread_unittest.cc",
       "sigslot_unittest.cc",
       "sigslottester_unittest.cc",
       "stream_unittest.cc",
       "testclient_unittest.cc",
       "thread_unittest.cc",
     ]
     if (is_win) {
       sources += [
         "win32_unittest.cc",
         "win32window_unittest.cc",
@@ skipping 28 matching lines @@
 if (is_android) {
   android_library("base_java") {
     java_files = [
       "java/src/org/webrtc/ContextUtils.java",
       "java/src/org/webrtc/Logging.java",
       "java/src/org/webrtc/Size.java",
       "java/src/org/webrtc/ThreadUtils.java",
     ]
   }
 }