Fix typo in comment about DnsConfigWatcher.

Review URL: https://codereview.chromium.org/135903009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245606 0039d316-1c4b-4281-b951-d872f2087c98

net/dns/dns_config_service_posix.cc

@@ -37,7 +37,7 @@ const base::FilePath::CharType* kFilePathHosts =
 
 #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;