sync: remove Chrome OS specific logic to deal with flimflam shutdown / sync race.

No longer necessary as the ProfileSyncService now aborts sync network traffic on shutdown.

BUG=chromium-os:20841


Review URL: http://codereview.chromium.org/9358007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@120912 0039d316-1c4b-4281-b951-d872f2087c98
void SyncManager::SyncInternal::OnIPAddressChanged() {
  DVLOG(1) << "IP address change detected";
  if (!observing_ip_address_changes_) {
    DVLOG(1) << "IP address change dropped.";
     return;
   }
 
   OnIPAddressChangedImpl();
 }

void SyncManager::SyncInternal::OnIPAddressChanged() {
  DVLOG(1) << "IP address change detected";
  if (!observing_ip_address_changes_) {
    DVLOG(1) << "IP address change dropped.";
     return;
   }
 
#if defined (OS_CHROMEOS)
  MessageLoop::current()->PostDelayedTask(
      FROM_HERE,
      base::Bind(&SyncInternal::OnIPAddressChangedImpl,
                 weak_ptr_factory_.GetWeakPtr()),
      kChromeOSNetworkChangeReactionDelayHackMsec);
#else
   OnIPAddressChangedImpl();
#endif  // defined(OS_CHROMEOS)
 }
