Require explicit selection of traits for LazyInstance

chrome/browser/ui/webui/print_preview/print_preview_ui.cc

Index: chrome/browser/ui/webui/print_preview/print_preview_ui.cc
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_ui.cc b/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
index 3a42194ea2f0f95861337b8302c1188e67fb13f7..3df34d9d4e2f983f89d9e948a7632479dd3c30e0 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_ui.cc
@@ -107,13 +107,13 @@ class PrintPreviewRequestIdMapWithLock {
 };
 
 // Written to on the UI thread, read from any thread.
-base::LazyInstance<PrintPreviewRequestIdMapWithLock>
+base::LazyInstance<PrintPreviewRequestIdMapWithLock>::DestructorAtExit
     g_print_preview_request_id_map = LAZY_INSTANCE_INITIALIZER;
 
 // PrintPreviewUI IDMap used to avoid exposing raw pointer addresses to WebUI.
 // Only accessed on the UI thread.
-base::LazyInstance<IDMap<PrintPreviewUI*>> g_print_preview_ui_id_map =
-    LAZY_INSTANCE_INITIALIZER;
+base::LazyInstance<IDMap<PrintPreviewUI*>>::DestructorAtExit
+    g_print_preview_ui_id_map = LAZY_INSTANCE_INITIALIZER;
 
 // PrintPreviewUI serves data for chrome://print requests.
 //