Cleanup to keep panel from manipulating its panel strip assignment directly.

chrome/browser/ui/panels/panel_manager.h

Index: chrome/browser/ui/panels/panel_manager.h
diff --git a/chrome/browser/ui/panels/panel_manager.h b/chrome/browser/ui/panels/panel_manager.h
index d02fe76d8b9d30282cdf61eed5ffd7ffea9a1d8a..717464a8cfc20e4a71d89dfc914a42f7d2e92f6c 100644
--- a/chrome/browser/ui/panels/panel_manager.h
+++ b/chrome/browser/ui/panels/panel_manager.h
@@ -13,6 +13,7 @@
 #include "base/timer.h"
 #include "chrome/browser/ui/panels/auto_hiding_desktop_bar.h"
 #include "chrome/browser/ui/panels/panel.h"
+#include "chrome/browser/ui/panels/panel_strip.h"
 #include "ui/gfx/rect.h"
 
 class Browser;
@@ -61,6 +62,9 @@ class PanelManager : public AutoHidingDesktopBar::Observer {
   // for panels that are auto-sized.
   void ResizePanel(Panel* panel, const gfx::Size& new_size);
 
+  // Changes the panel's layout to a different type of panel strip.
+  void ChangePanelLayout(Panel* panel, PanelStrip::Type new_layout);
+
   // Returns true if we should bring up the titlebars, given the current mouse
   // point.
   bool ShouldBringUpTitlebars(int mouse_x, int mouse_y) const;