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

chrome/browser/extensions/external_install_manager.h

Index: chrome/browser/extensions/external_install_manager.h
diff --git a/chrome/browser/extensions/external_install_manager.h b/chrome/browser/extensions/external_install_manager.h
index 82732fac825d2c4b6e6bb877110fdeb620242e5f..51f3a14721125a112e599e879c0c717394a208c0 100644
--- a/chrome/browser/extensions/external_install_manager.h
+++ b/chrome/browser/extensions/external_install_manager.h
@@ -6,9 +6,9 @@
 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_INSTALL_MANAGER_H_
 
 #include <map>
+#include <memory>
 
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/scoped_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
@@ -95,7 +95,7 @@ class ExternalInstallManager : public ExtensionRegistryObserver,
   ExtensionPrefs* extension_prefs_;
 
   // The collection of ExternalInstallErrors.
-  std::map<std::string, scoped_ptr<ExternalInstallError>> errors_;
+  std::map<std::string, std::unique_ptr<ExternalInstallError>> errors_;
 
   std::set<std::string> shown_ids_;