[Extensions] Fix crash in extension uninstall dialog

chrome/browser/extensions/extension_uninstall_dialog.h

Index: chrome/browser/extensions/extension_uninstall_dialog.h
diff --git a/chrome/browser/extensions/extension_uninstall_dialog.h b/chrome/browser/extensions/extension_uninstall_dialog.h
index 4a3a32f2381102795dfcd3890dd36e77060f6b24..3f750281dc7e0dfd00d6d531fcaee5ee2f377cd9 100644
--- a/chrome/browser/extensions/extension_uninstall_dialog.h
+++ b/chrome/browser/extensions/extension_uninstall_dialog.h
@@ -91,11 +91,11 @@ class ExtensionUninstallDialog
   Delegate* delegate_;
 
   // The extension we are showing the dialog for.
-  const Extension* extension_;
+  scoped_refptr<const Extension> extension_;
 
   // The extension triggering the dialog if the dialog was shown by
   // chrome.management.uninstall.
-  const Extension* triggering_extension_;
+  scoped_refptr<const Extension> triggering_extension_;
 
   // The extensions icon.
   gfx::ImageSkia icon_;