Remove some linked_ptr c/b/extension

chrome/browser/extensions/install_verifier.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_INSTALL_VERIFIER_H_
 #define CHROME_BROWSER_EXTENSIONS_INSTALL_VERIFIER_H_
 
 #include <memory>
 #include <queue>
 #include <set>
 #include <string>
 
 #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"
 #include "extensions/common/extension.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace net {
@@ skipping 137 matching lines @@
   bool bootstrap_check_complete_;
 
   // This is the most up-to-date signature, read out of |prefs_| during
   // initialization and updated anytime we get new id's added.
   std::unique_ptr<InstallSignature> signature_;
 
   // The current InstallSigner, if we have a signature request running.
   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.
   ExtensionIdSet provisional_;
 
   base::WeakPtrFactory<InstallVerifier> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InstallVerifier);
 };
 
 // Instances of this class can be constructed to disable install verification
 // during tests.
 class ScopedInstallVerifierBypassForTest {
  public:
   ScopedInstallVerifierBypassForTest();
   ~ScopedInstallVerifierBypassForTest();
 
   // Should install verification be bypassed?
   static bool ShouldBypass();
 
  private:
   bool old_value_;
   DISALLOW_COPY_AND_ASSIGN(ScopedInstallVerifierBypassForTest);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_INSTALL_VERIFIER_H_