Remove some linked_ptr c/b/extension

chrome/browser/extensions/install_verifier.h

Index: chrome/browser/extensions/install_verifier.h
diff --git a/chrome/browser/extensions/install_verifier.h b/chrome/browser/extensions/install_verifier.h
index b04e67051be66fb4ba4fcbd9c9b1aa5e4e145ea2..fdda7f21b3d2e61766165b726aaf7dfec7e11f8f 100644
--- a/chrome/browser/extensions/install_verifier.h
+++ b/chrome/browser/extensions/install_verifier.h
@@ -12,7 +12,6 @@
 
 #include "base/callback.h"
 #include "base/macros.h"
-#include "base/memory/linked_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "extensions/browser/management_policy.h"
@@ -170,7 +169,7 @@ class InstallVerifier : public KeyedService,
   std::unique_ptr<InstallSigner> signer_;
 
   // A queue of operations to apply to the current set of allowed ids.
-  std::queue<linked_ptr<PendingOperation> > operation_queue_;
+  std::queue<std::unique_ptr<PendingOperation>> operation_queue_;
 
   // A set of ids that have been provisionally added, which we're willing to
   // consider allowed until we hear back from the server signature request.