Revert 221651 "Switch to doing user-resizing via system for pane..."

trunk/src/chrome/browser/ui/panels/panel.cc

Index: trunk/src/chrome/browser/ui/panels/panel.cc
===================================================================
--- trunk/src/chrome/browser/ui/panels/panel.cc	(revision 221673)
+++ trunk/src/chrome/browser/ui/panels/panel.cc	(working copy)
@@ -667,6 +667,11 @@
   in_preview_mode_ = in_preview;
 }
 
+void Panel::EnableResizeByMouse(bool enable) {
+  DCHECK(native_panel_);
+  native_panel_->EnableResizeByMouse(enable);
+}
+
 void Panel::UpdateMinimizeRestoreButtonVisibility() {
   native_panel_->UpdatePanelMinimizeRestoreButtonVisibility();
 }