Convert //chrome/browser/extensions from scoped_ptr to std::unique_ptr

chrome/browser/extensions/policy_handlers.h

Index: chrome/browser/extensions/policy_handlers.h
diff --git a/chrome/browser/extensions/policy_handlers.h b/chrome/browser/extensions/policy_handlers.h
index 5dd688bb6c95a5cc8a713f405d32cee70bbc28d5..cd7e5d99cc722a8c678b4ea9be0ab9ea08e2de6e 100644
--- a/chrome/browser/extensions/policy_handlers.h
+++ b/chrome/browser/extensions/policy_handlers.h
@@ -5,8 +5,9 @@
 #ifndef CHROME_BROWSER_EXTENSIONS_POLICY_HANDLERS_H_
 #define CHROME_BROWSER_EXTENSIONS_POLICY_HANDLERS_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "components/policy/core/browser/configuration_policy_handler.h"
 
@@ -39,7 +40,7 @@ class ExtensionListPolicyHandler
   // Runs sanity checks on the policy value and returns it in |extension_ids|.
   bool CheckAndGetList(const policy::PolicyMap& policies,
                        policy::PolicyErrorMap* errors,
-                       scoped_ptr<base::ListValue>* extension_ids);
+                       std::unique_ptr<base::ListValue>* extension_ids);
 
  private:
   const char* pref_path_;