Enable CursorManager::LockCursor to lock cursor visibility.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 560e5e82b4b7ffb78343d97704546b270394bbd4..7f7a45c3efc330d4e77bfdfecbdbf9f250172545 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -211,8 +211,6 @@ Shell::~Shell() {
   if (active_root_window_)
     active_root_window_->GetFocusManager()->SetFocusedWindow(NULL, NULL);
 
-  cursor_manager_.set_delegate(NULL);
-
   // Please keep in same order as in Init() because it's easy to miss one.
   RemoveEnvEventFilter(user_activity_detector_.get());
   RemoveEnvEventFilter(event_rewriter_filter_.get());
@@ -363,8 +361,6 @@ void Shell::Init() {
   env_filter_.reset(new aura::shared::CompoundEventFilter);
   AddEnvEventFilter(env_filter_.get());
 
-  cursor_manager_.set_delegate(this);
-
   focus_manager_.reset(new aura::FocusManager);
   activation_controller_.reset(
       new internal::ActivationController(focus_manager_.get()));
@@ -762,18 +758,4 @@ void Shell::InitLayoutManagersForPrimaryDisplay(
   panel_container->SetLayoutManager(panel_layout_manager_);
 }
 
-void Shell::SetCursor(gfx::NativeCursor cursor) {
-  RootWindowList root_windows = GetAllRootWindows();
-  for (RootWindowList::iterator iter = root_windows.begin();
-       iter != root_windows.end(); ++iter)
-    (*iter)->SetCursor(cursor);
-}
-
-void Shell::ShowCursor(bool visible) {
-  RootWindowList root_windows = GetAllRootWindows();
-  for (RootWindowList::iterator iter = root_windows.begin();
-       iter != root_windows.end(); ++iter)
-    (*iter)->ShowCursor(visible);
-}
-
 }  // namespace ash