Revert: Remove WindowTreeClientDelegate::GetCaptureClient() and WindowTreeClient::GetCaptureClient()

services/navigation/view_impl.cc

Index: services/navigation/view_impl.cc
diff --git a/services/navigation/view_impl.cc b/services/navigation/view_impl.cc
index 655ccaa9c3ab1a2ca585887427d3f493c78dcd35..578cb90093b4579d4e69f3a38aebca3edf09b9aa 100644
--- a/services/navigation/view_impl.cc
+++ b/services/navigation/view_impl.cc
@@ -300,6 +300,11 @@
 void ViewImpl::OnPointerEventObserved(const ui::PointerEvent& event,
                                       aura::Window* target) {}
 
+aura::client::CaptureClient* ViewImpl::GetCaptureClient() {
+  // TODO: wire this up. This typically comes from WMState.
+  return nullptr;
+}
+
 aura::PropertyConverter* ViewImpl::GetPropertyConverter() {
   // TODO: wire this up.
   return nullptr;