Change panels to be able to turn off autoresize.

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 b86f15e36d8092df68eebd978370104bab3640db..bbd9d7928a448c2759ec9d71370e842a9e04c938 100644
--- a/chrome/browser/ui/panels/panel_manager.cc
+++ b/chrome/browser/ui/panels/panel_manager.cc
@@ -174,20 +174,13 @@ void PanelManager::OnPanelExpansionStateChanged(Panel* panel) {
 
 void PanelManager::OnPreferredWindowSizeChanged(
     Panel* panel, const gfx::Size& preferred_window_size) {
-  if (!auto_sizing_enabled_) {
-    LOG(INFO) << "Resizing auto-resizable Panels is not supported yet.";
-    return;
-  }
+  DCHECK(auto_sizing_enabled_);
   docked_strip_->ResizePanelWindow(panel, preferred_window_size);
 }
 
 void PanelManager::ResizePanel(Panel* panel, const gfx::Size& new_size) {
-  // Explicit resizing is not allowed for auto-resizable panels for now.
-  // http://crbug.com/109343
-  if (panel->auto_resizable())
-    return;
-
   docked_strip_->ResizePanelWindow(panel, new_size);
+  panel->SetAutoResizable(false);
 }
 
 bool PanelManager::ShouldBringUpTitlebars(int mouse_x, int mouse_y) const {