Make FileReader return ownership of the string content

chrome/browser/chromeos/accessibility/accessibility_manager.cc

Index: chrome/browser/chromeos/accessibility/accessibility_manager.cc
diff --git a/chrome/browser/chromeos/accessibility/accessibility_manager.cc b/chrome/browser/chromeos/accessibility/accessibility_manager.cc
index 8dee33378a3c86e0d7c1713a8b918fa7281fa7aa..b0ab895f54e5c03cb45123ec6f5afaab718d1611 100644
--- a/chrome/browser/chromeos/accessibility/accessibility_manager.cc
+++ b/chrome/browser/chromeos/accessibility/accessibility_manager.cc
@@ -190,12 +190,12 @@ class ContentScriptLoader {
   }
 
  private:
-  void OnFileLoaded(bool success, const std::string& data) {
+  void OnFileLoaded(bool success, std::unique_ptr<std::string> data) {
     if (success) {
       RenderViewHost* render_view_host =
           RenderViewHost::FromID(render_process_id_, render_view_id_);
       if (render_view_host)
-        ExecuteScriptHelper(render_view_host, data, extension_id_);
+        ExecuteScriptHelper(render_view_host, *data, extension_id_);
     }
     Run();
   }