Adds some debugging code in hopes of figuring out who is removing the...

chrome/browser/views/bookmark_bar_view.cc

Index: chrome/browser/views/bookmark_bar_view.cc
===================================================================
--- chrome/browser/views/bookmark_bar_view.cc	(revision 10292)
+++ chrome/browser/views/bookmark_bar_view.cc	(working copy)
@@ -24,6 +24,7 @@
 #include "chrome/browser/view_ids.h"
 #include "chrome/browser/views/bookmark_editor_view.h"
 #include "chrome/browser/views/event_utils.h"
+#include "chrome/browser/views/frame/browser_view.h"
 #include "chrome/browser/views/input_window.h"
 #include "chrome/common/gfx/chrome_canvas.h"
 #include "chrome/common/gfx/favicon_size.h"
@@ -868,7 +869,13 @@
 }
 
 void BookmarkBarView::ViewHierarchyChanged(bool is_add,
-                                           View* parent, View* child) {
+                                           View* parent,
+                                           View* child) {
+  // See http://code.google.com/p/chromium/issues/detail?id=7857 . It seems
+  // as though the bookmark bar is getting unintentionally removed.
+  DCHECK(child != this || !is_add ||
+         static_cast<BrowserView*>(parent)->is_removing_bookmark_bar());
+
   if (is_add && child == this && height() > 0) {
     // We only layout while parented. When we become parented, if our bounds
     // haven't changed, DidChangeBounds won't get invoked and we won't layout.