Panel strip refactor cleanup.

chrome/browser/ui/panels/panel_manager.cc

Index: chrome/browser/ui/panels/panel_manager.cc
diff --git a/chrome/browser/ui/panels/panel_manager.cc b/chrome/browser/ui/panels/panel_manager.cc
index 30eb6cd95df05814e63b4b48a5ebe3500667a3f1..bdd139e161324b9e3edc30ce603c4ea290847c7a 100644
--- a/chrome/browser/ui/panels/panel_manager.cc
+++ b/chrome/browser/ui/panels/panel_manager.cc
@@ -225,10 +225,10 @@ int PanelManager::num_panels() const {
   return panel_strip_->num_panels() + panel_overflow_strip_->num_panels();
 }
 
-bool PanelManager::is_dragging_panel() const {
-  return panel_strip_->is_dragging_panel();
-}
-
 const PanelManager::Panels& PanelManager::panels() const {
   return panel_strip_->panels();
 }
+
+void PanelManager::SetMouseWatcher(PanelMouseWatcher* watcher) {
+  panel_mouse_watcher_.reset(watcher);
+}