Use extension-based file picker from CrOS for Aura builds.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index ae2e69a98a69b96c9878ca6d9671f90849ec7bce..d0158206a181d63d375eaac508cd3625e7706f40 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -567,10 +567,6 @@ const char kShowPlanNotifications[] =
 const char kShow3gPromoNotification[] =
     "settings.internet.mobile.show_3g_promo_notification";
 
-// Map of timestamps of the last used file browser tasks.
-const char kLastUsedFileBrowserHandlers[] =
-    "filebrowser.handler.lastused";
-
 // A boolean pref that uses shared proxies.
 const char kUseSharedProxies[] = "settings.use_shared_proxies";
 
@@ -1065,6 +1061,10 @@ const char kSelectFileLastDirectory[] = "selectfile.last_directory";
 // Boolean that specifies if file selection dialogs are shown.
 const char kAllowFileSelectionDialogs[] = "select_file_dialogs.allowed";
 
+// Map of timestamps of the last used file browser tasks.
+const char kLastUsedFileBrowserHandlers[] =
+    "filebrowser.handler.lastused";
+
 // Extensions which should be opened upon completion.
 const char kDownloadExtensionsToOpen[] = "download.extensions_to_open";