Remove some linked_ptr c/b/extension

chrome/browser/extensions/api/gcd_private/gcd_private_api.cc

Index: chrome/browser/extensions/api/gcd_private/gcd_private_api.cc
diff --git a/chrome/browser/extensions/api/gcd_private/gcd_private_api.cc b/chrome/browser/extensions/api/gcd_private/gcd_private_api.cc
index 9541d0efa5c7a929297dc2b82d40a8cfadddddc6..d21dc8f19f6d34fb0b15df9dad066a4fc4913480 100644
--- a/chrome/browser/extensions/api/gcd_private/gcd_private_api.cc
+++ b/chrome/browser/extensions/api/gcd_private/gcd_private_api.cc
@@ -4,9 +4,10 @@
 
 #include "chrome/browser/extensions/api/gcd_private/gcd_private_api.h"
 
+#include <memory>
+
 #include "base/lazy_instance.h"
 #include "base/macros.h"
-#include "base/memory/linked_ptr.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/extensions/api/gcd_private/privet_v3_context_getter.h"
 #include "chrome/browser/extensions/api/gcd_private/privet_v3_session.h"
@@ -93,8 +94,8 @@ class GcdPrivateAPIImpl {
       service_discovery_client_;
 
   struct SessionInfo {
-    linked_ptr<PrivetV3Session> session;
-    linked_ptr<local_discovery::EndpointResolver> resolver;
+    std::unique_ptr<PrivetV3Session> session;
+    std::unique_ptr<local_discovery::EndpointResolver> resolver;
   };
 
   std::map<int, SessionInfo> sessions_;