Makes CaptureController be created and owned by WMState

ui/wm/core/wm_state.cc

Index: ui/wm/core/wm_state.cc
diff --git a/ui/wm/core/wm_state.cc b/ui/wm/core/wm_state.cc
index 6d580863394b0c4b0c4639647d778c071ae44796..35ec554d5c683a4b05c63bfe9253ae8b66cabc48 100644
--- a/ui/wm/core/wm_state.cc
+++ b/ui/wm/core/wm_state.cc
@@ -5,6 +5,7 @@
 #include "ui/wm/core/wm_state.h"
 
 #include "ui/events/platform/platform_event_source.h"
+#include "ui/wm/core/capture_controller.h"
 #include "ui/wm/core/transient_window_controller.h"
 #include "ui/wm/core/transient_window_stacking_client.h"
 
@@ -12,7 +13,8 @@ namespace wm {
 
 WMState::WMState()
     : window_stacking_client_(new TransientWindowStackingClient),
-      transient_window_client_(new TransientWindowController) {
+      transient_window_client_(new TransientWindowController),
+      capture_controller_(base::MakeUnique<CaptureController>()) {
   aura::client::SetWindowStackingClient(window_stacking_client_.get());
   aura::client::SetTransientWindowClient(transient_window_client_.get());
 }