Remove the (broken and unneeded) 'force_update' option from ServiceWatcher::DiscoverNewDevices.

chrome/browser/media/router/discovery/mdns/dns_sd_device_lister.cc

Index: chrome/browser/media/router/discovery/mdns/dns_sd_device_lister.cc
diff --git a/chrome/browser/media/router/discovery/mdns/dns_sd_device_lister.cc b/chrome/browser/media/router/discovery/mdns/dns_sd_device_lister.cc
index cd0e4fda459bdaa2dbfe90b258856bcf8c094827..00b3883d54329606d505981bd1f5083a47831fbf 100644
--- a/chrome/browser/media/router/discovery/mdns/dns_sd_device_lister.cc
+++ b/chrome/browser/media/router/discovery/mdns/dns_sd_device_lister.cc
@@ -35,14 +35,14 @@ DnsSdDeviceLister::DnsSdDeviceLister(
 
 DnsSdDeviceLister::~DnsSdDeviceLister() {}
 
-void DnsSdDeviceLister::Discover(bool force_update) {
+void DnsSdDeviceLister::Discover() {
   if (!started_) {
     device_lister_.Start();
     started_ = true;
     VLOG(1) << "Started device lister for service type "
             << device_lister_.service_type();
   }
-  device_lister_.DiscoverNewDevices(force_update);
+  device_lister_.DiscoverNewDevices();
   VLOG(1) << "Discovery new devices for service type "
           << device_lister_.service_type();
 }
@@ -70,7 +70,7 @@ void DnsSdDeviceLister::OnDeviceCacheFlushed() {
   VLOG(1) << "OnDeviceCacheFlushed: "
           << "service_type: " << device_lister_.service_type();
   delegate_->ServicesFlushed(device_lister_.service_type());
-  device_lister_.DiscoverNewDevices(false);
+  device_lister_.DiscoverNewDevices();
 }
 
 }  // namespace media_router