Linux: Add some CHECKs to figure out a crash.

BUG=89388
TEST=none

Review URL: http://codereview.chromium.org/7587015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96325 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/tab_contents/web_drag_dest_gtk.cc

@@ -90,7 +90,9 @@ void WebDragDestGtk::UpdateDragStatus(WebDragOperation operation) {
 void WebDragDestGtk::DragLeave() {
   tab_contents_->render_view_host()->DragTargetDragLeave();
 
-  DCHECK(tab_);
+  // TODO(thestig) Turn back to DCHECKs after we figure out bug 89388.
+  CHECK(tab_);
+  CHECK(tab_->bookmark_tab_helper());
   if (tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()) {
     tab_->bookmark_tab_helper()->GetBookmarkDragDelegate()->OnDragLeave(
         bookmark_drag_data_);