mash: remove more shell/shelf WmWindow usage.

chrome/browser/ui/webui/chromeos/first_run/first_run_ui.cc

Index: chrome/browser/ui/webui/chromeos/first_run/first_run_ui.cc
diff --git a/chrome/browser/ui/webui/chromeos/first_run/first_run_ui.cc b/chrome/browser/ui/webui/chromeos/first_run/first_run_ui.cc
index 9601a74fac062a425b957e1cf64ac78cd397f25f..56d40d4f8229e8721d860985a3c84536595671f5 100644
--- a/chrome/browser/ui/webui/chromeos/first_run/first_run_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/first_run/first_run_ui.cc
@@ -5,7 +5,7 @@
 #include "chrome/browser/ui/webui/chromeos/first_run/first_run_ui.h"
 
 #include "ash/shelf/wm_shelf.h"
-#include "ash/shell_port.h"
+#include "ash/shell.h"
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/browser_process.h"
@@ -67,7 +67,7 @@ void SetLocalizedStrings(base::DictionaryValue* localized_strings) {
       "accessibleTitle",
       l10n_util::GetStringUTF16(IDS_FIRST_RUN_STEP_ACCESSIBLE_TITLE));
   ash::WmShelf* shelf =
-      ash::WmShelf::ForWindow(ash::ShellPort::Get()->GetPrimaryRootWindow());
+      ash::WmShelf::ForWindow(ash::Shell::GetPrimaryRootWindow());
   std::string shelf_alignment;
   switch (shelf->alignment()) {
     case ash::SHELF_ALIGNMENT_BOTTOM: