MacViews: Fix BrowserClient for toolkit-views on Mac

chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc

Index: chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
diff --git a/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc b/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
index 259b07363833b1f64c1115e349905d1f4cf2a983..3e3adb0562a7f4bc210d11ffa42a83beabd44206 100644
--- a/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
+++ b/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
@@ -17,6 +17,7 @@
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/screen.h"
 #include "ui/views/widget/native_widget_aura.h"
+#include "ui/wm/core/wm_state.h"
 
 #if defined(USE_X11) && !defined(OS_CHROMEOS)
 #include "base/prefs/pref_service.h"
@@ -105,6 +106,8 @@ void ChromeBrowserMainExtraPartsAura::PreEarlyInitialization() {
 }
 
 void ChromeBrowserMainExtraPartsAura::ToolkitInitialized() {
+  wm_state_.reset(new wm::WMState);
+
 #if !defined(OS_CHROMEOS)
 #if defined(USE_ASH)
   CHECK(aura::Env::GetInstance());