Fix typo in comment about DnsConfigWatcher.

net/dns/dns_config_service_posix.cc

 // Copyright (c) 2012 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.
 
 #include "net/dns/dns_config_service_posix.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 19 matching lines @@
 #if !defined(OS_ANDROID)
 namespace internal {
 
 namespace {
 
 const base::FilePath::CharType* kFilePathHosts =
     FILE_PATH_LITERAL("/etc/hosts");
 
 #if defined(OS_IOS)
 
-// There is no plublic API to watch the DNS configuration on iOS.
+// There is no public API to watch the DNS configuration on iOS.
 class DnsConfigWatcher {
  public:
   typedef base::Callback<void(bool succeeded)> CallbackType;
 
   bool Watch(const CallbackType& callback) {
     return false;
   }
 };
 
 #elif !defined(OS_MACOSX)
@@ skipping 377 matching lines @@
   virtual void ReadNow() OVERRIDE {}
   virtual bool StartWatching() OVERRIDE { return false; }
 };
 // static
 scoped_ptr<DnsConfigService> DnsConfigService::CreateSystemService() {
   return scoped_ptr<DnsConfigService>(new StubDnsConfigService());
 }
 #endif
 
 }  // namespace net