Separate BrowserWindow from Panel class.

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 be3ad437c37ed214e66edd6ddaebbe0c0ea8ab39..77cfc03e65fd587bf5930552feb1ad7ac4ee612e 100644
--- a/chrome/browser/ui/panels/panel_manager.cc
+++ b/chrome/browser/ui/panels/panel_manager.cc
@@ -11,6 +11,7 @@
 #include "base/message_loop.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/panels/detached_panel_strip.h"
 #include "chrome/browser/ui/panels/docked_panel_strip.h"
 #include "chrome/browser/ui/panels/panel_drag_controller.h"
@@ -216,12 +217,6 @@ void PanelManager::OnPanelExpansionStateChanged(Panel* panel) {
 
 }
 
-void PanelManager::OnWindowAutoResized(Panel* panel,
-                                       const gfx::Size& preferred_window_size) {
-  DCHECK(auto_sizing_enabled_);
-  panel->panel_strip()->ResizePanelWindow(panel, preferred_window_size);
-}
-
 void PanelManager::ResizePanel(Panel* panel, const gfx::Size& new_size) {
   PanelStrip* panel_strip = panel->panel_strip();
   if (!panel_strip)