Deleted unused method EstimateMTU, and the WinPing 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 593 matching lines @@
 
   if (is_win) {
     sources += [
       "win32.cc",
       "win32.h",
       "win32filesystem.cc",
       "win32filesystem.h",
       "win32securityerrors.cc",
       "win32window.cc",
       "win32window.h",
-      "winping.cc",
-      "winping.h",
     ]
 
     libs += [
       "crypt32.lib",
       "iphlpapi.lib",
       "secur32.lib",
     ]
 
     cflags += [
       # Suppress warnings about WIN32_LEAN_AND_MEAN.
@@ skipping 348 matching lines @@
 
 if (is_android) {
   android_library("base_java") {
     java_files = [
       "java/src/org/webrtc/Logging.java",
       "java/src/org/webrtc/Size.java",
       "java/src/org/webrtc/ThreadUtils.java",
     ]
   }
 }