Reunite PanelStrip::AddPanel and its internals.

chrome/browser/ui/panels/panel.cc

Index: chrome/browser/ui/panels/panel.cc
diff --git a/chrome/browser/ui/panels/panel.cc b/chrome/browser/ui/panels/panel.cc
index b9c271fc5e237b2b6c051caffdfb06d535c1f4b9..2c92c2279f726be13fa650b1bf2fbf3ab13494a8 100644
--- a/chrome/browser/ui/panels/panel.cc
+++ b/chrome/browser/ui/panels/panel.cc
@@ -107,6 +107,9 @@ void Panel::SetAutoResizable(bool resizable) {
 }
 
 void Panel::SetSizeRange(const gfx::Size& min_size, const gfx::Size& max_size) {
+  if (min_size == min_size_ && max_size == max_size_)
+    return;
+
   DCHECK(min_size.width() <= max_size.width());
   DCHECK(min_size.height() <= max_size.height());
   min_size_ = min_size;