ash: Remove ash::Shelf in favor of ash::WmShelf

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 abdf77b3afbb1bb03cd453f1847f56ba120651be..2cb7dabb7fc0c58f6d17c83540cc183c008ac29c 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
@@ -4,8 +4,8 @@
 
 #include "chrome/browser/ui/webui/chromeos/first_run/first_run_ui.h"
 
-#include "ash/common/shelf/shelf.h"
 #include "ash/common/shelf/wm_shelf.h"
+#include "ash/common/wm_shell.h"
 #include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
@@ -62,8 +62,10 @@ void SetLocalizedStrings(base::DictionaryValue* localized_strings) {
       "transitionsEnabled",
       base::CommandLine::ForCurrentProcess()->HasSwitch(
           chromeos::switches::kEnableFirstRunUITransitions));
+  ash::WmShelf* shelf =
+      ash::WmShelf::ForWindow(ash::WmShell::Get()->GetPrimaryRootWindow());
   std::string shelf_alignment;
-  switch (ash::Shelf::ForPrimaryDisplay()->wm_shelf()->alignment()) {
+  switch (shelf->alignment()) {
     case ash::SHELF_ALIGNMENT_BOTTOM:
     case ash::SHELF_ALIGNMENT_BOTTOM_LOCKED:
       shelf_alignment = kShelfAlignmentBottom;