Remove WmLookup.

ash/common/system/tray/tray_bubble_wrapper.cc

Index: ash/common/system/tray/tray_bubble_wrapper.cc
diff --git a/ash/common/system/tray/tray_bubble_wrapper.cc b/ash/common/system/tray/tray_bubble_wrapper.cc
index 9d993aee75439f91a0807c2b436682ced004e7e0..549504294e22ff051188274b2f58206585326309 100644
--- a/ash/common/system/tray/tray_bubble_wrapper.cc
+++ b/ash/common/system/tray/tray_bubble_wrapper.cc
@@ -6,7 +6,6 @@
 
 #include "ash/common/system/tray/tray_background_view.h"
 #include "ash/common/system/tray/tray_event_filter.h"
-#include "ash/common/wm_lookup.h"
 #include "ash/common/wm_window.h"
 #include "ui/views/bubble/tray_bubble_view.h"
 #include "ui/views/widget/widget.h"
@@ -43,7 +42,7 @@ void TrayBubbleWrapper::OnWidgetDestroying(views::Widget* widget) {
   // will invoke PerformAction which reopens the bubble again. To prevent the
   // reopen, the mouse capture of |tray_| has to be released.
   // See crbug.com/177075
-  WmLookup::Get()->GetWindowForWidget(tray_->GetWidget())->ReleaseCapture();
+  WmWindow::Get(tray_->GetWidget()->GetNativeWindow())->ReleaseCapture();
 
   tray_->HideBubbleWithView(bubble_view_);  // May destroy |bubble_view_|
 }