Some linked_ptr -> unique_ptr conversion in extensions/browser.

chrome/browser/chromeos/extensions/file_manager/event_router.cc

Index: chrome/browser/chromeos/extensions/file_manager/event_router.cc
diff --git a/chrome/browser/chromeos/extensions/file_manager/event_router.cc b/chrome/browser/chromeos/extensions/file_manager/event_router.cc
index acc543b9513f09a84942b2a2d9500d4c2c7e0256..d31c4366f028d0b67b3056164516647860412cd8 100644
--- a/chrome/browser/chromeos/extensions/file_manager/event_router.cc
+++ b/chrome/browser/chromeos/extensions/file_manager/event_router.cc
@@ -342,7 +342,7 @@ class JobEventRouterImpl : public JobEventRouter {
 
     std::set<std::string> extension_ids;
 
-    for (const auto listener : listeners) {
+    for (const auto& listener : listeners) {
       extension_ids.insert(listener->extension_id());
     }