Convert //chrome/installer from scoped_ptr to std::unique_ptr

chrome/installer/util/registry_key_backup.h

Index: chrome/installer/util/registry_key_backup.h
diff --git a/chrome/installer/util/registry_key_backup.h b/chrome/installer/util/registry_key_backup.h
index 6d4e9f899a41a418f9d1265255ff777f48beaa3b..df4636ff9033014770633d038b44b9545e832931 100644
--- a/chrome/installer/util/registry_key_backup.h
+++ b/chrome/installer/util/registry_key_backup.h
@@ -7,8 +7,9 @@
 
 #include <windows.h>
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 
 // A container for a registry key, its values, and its subkeys.  We don't use
 // more obvious methods for various reasons:
@@ -41,7 +42,7 @@ class RegistryKeyBackup {
   class KeyData;
 
   // The values and subkeys of the backed-up key.
-  scoped_ptr<KeyData> key_data_;
+  std::unique_ptr<KeyData> key_data_;
 
   DISALLOW_COPY_AND_ASSIGN(RegistryKeyBackup);
 };