Moves TransientWindowClient to ui/aura/client and adds observer

content/shell/browser/shell.h

Index: content/shell/browser/shell.h
diff --git a/content/shell/browser/shell.h b/content/shell/browser/shell.h
index d32886d1083c17c22321e50ea26a73fb1c4115f5..6f36810032181c1cb1adf595961a10c8e5826579 100644
--- a/content/shell/browser/shell.h
+++ b/content/shell/browser/shell.h
@@ -36,6 +36,9 @@ namespace views {
 class Widget;
 class ViewsDelegate;
 }
+namespace wm {
+class WMState;
+}
 #endif  // defined(USE_AURA)
 
 class GURL;
@@ -253,6 +256,8 @@ class Shell : public WebContentsDelegate,
 #if defined(OS_CHROMEOS)
   static wm::WMTestHelper* wm_test_helper_;
   static display::Screen* test_screen_;
+#else
+  static wm::WMState* wm_state_;
 #endif
 #if defined(TOOLKIT_VIEWS)
   static views::ViewsDelegate* views_delegate_;