Makes ash/wm/common a library

ash/wm/aura/wm_window_aura.cc

Index: ash/wm/aura/wm_window_aura.cc
diff --git a/ash/wm/aura/wm_window_aura.cc b/ash/wm/aura/wm_window_aura.cc
index 51a9ed1edd863c96a3acae13eaa483599111e7ec..37dc81384bb891af8f0ef54f68fc15517b4e6ec8 100644
--- a/ash/wm/aura/wm_window_aura.cc
+++ b/ash/wm/aura/wm_window_aura.cc
@@ -76,11 +76,6 @@ WmWindowAura::WmWindowAura(aura::Window* window)
 }
 
 // static
-WmWindow* WmWindow::Get(views::Widget* widget) {
-  return WmWindowAura::Get(widget->GetNativeWindow());
-}
-
-// static
 WmWindow* WmWindowAura::Get(aura::Window* window) {
   if (!window)
     return nullptr;
@@ -117,7 +112,7 @@ WmRootWindowController* WmWindowAura::GetRootWindowController() {
 }
 
 WmGlobals* WmWindowAura::GetGlobals() const {
-  return WmGlobalsAura::Get();
+  return WmGlobals::Get();
 }
 
 void WmWindowAura::SetName(const std::string& name) {