Remove linked_ptr usage in //base.

chrome/browser/printing/cloud_print/privet_notifications.cc

Index: chrome/browser/printing/cloud_print/privet_notifications.cc
diff --git a/chrome/browser/printing/cloud_print/privet_notifications.cc b/chrome/browser/printing/cloud_print/privet_notifications.cc
index 81c8120eff320a9ff132639ab2f8266e8f59d8bd..29275adc374b24193711a2cd184ca22bb99e8ae4 100644
--- a/chrome/browser/printing/cloud_print/privet_notifications.cc
+++ b/chrome/browser/printing/cloud_print/privet_notifications.cc
@@ -101,13 +101,11 @@ void PrivetNotificationsListener::DeviceChanged(
     return;  // Already saw this device.
   }
 
-  linked_ptr<DeviceContext> device_context(new DeviceContext);
-
+  scoped_ptr<DeviceContext>& device_context = devices_seen_[name];
+  device_context.reset(new DeviceContext);
   device_context->notification_may_be_active = false;
   device_context->registered = !description.id.empty();
 
-  devices_seen_.insert(make_pair(name, device_context));
-
   if (!device_context->registered) {
     device_context->privet_http_resolution =
         privet_http_factory_->CreatePrivetHTTP(name);