Fix assert in sad_tab when requested width for message is < -1.

chrome/browser/gtk/sad_tab_gtk.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/gtk/sad_tab_gtk.h"
 
 #include <string>
 
 #include "app/gfx/gtk_util.h"
 #include "app/l10n_util.h"
@@ skipping 150 matching lines @@
     const SadTabGtkConstants& sad_tab_constants = g_sad_tab_constants.Get();
     int icon_height = gdk_pixbuf_get_height(sad_tab_constants.sad_tab_bitmap);
     int icon_y = ((height_ - icon_height) / 2) + kSadTabOffset;
     gtk_alignment_set_padding(GTK_ALIGNMENT(top_padding_), std::max(icon_y, 0),
                               0, kTabHorzMargin, kTabHorzMargin);
   }
 
   // Only readjust width for message if width of widget has changed.
   if (allocation->width != 0 && allocation->width != width_) {
     width_ = allocation->width;
-    // Set width for wrappable message.
-    gtk_widget_set_size_request(message_, width_ - (kTabHorzMargin * 2), -1);
+    // If necessary, set width for wrappable message.
+    int message_width = width_ - (kTabHorzMargin * 2);
+    if (message_width > -1)
+      gtk_widget_set_size_request(message_, message_width, -1);
   }
 }
 
 // static
 void SadTabGtk::OnLinkButtonClick(GtkWidget* button, const char* url) {
   BrowserList::GetLastActive()->OpenURL(GURL(url), GURL(), CURRENT_TAB,
                                         PageTransition::LINK);
 }