Linux: fix icon theme double free on shutdown....

base/mime_util_linux.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 "base/mime_util.h"
 
 #include <gtk/gtk.h>
 #include <sys/time.h>
 #include <time.h>
 
@@ skipping 493 matching lines @@
     // Assume it's Gnome and use GTK to figure out the theme.
     gchar* gtk_theme_name;
     g_object_get(gtk_settings_get_default(),
                  "gtk-icon-theme-name",
                  &gtk_theme_name, NULL);
     default_themes[1] = IconTheme::LoadTheme(gtk_theme_name);
     default_themes[2] = IconTheme::LoadTheme("gnome");
   }
   // hicolor needs to be last per icon theme spec.
   default_themes[3] = IconTheme::LoadTheme("hicolor");
+
+  for (size_t i = 0; i < MimeUtilConstants::kDefaultThemeNum; i++) {
+    if (default_themes[i] == NULL)
+      continue;
+    // NULL out duplicate pointers.
+    for (size_t j = i + 1; j < MimeUtilConstants::kDefaultThemeNum; j++) {
+      if (default_themes[j] == default_themes[i])
+        default_themes[j] = NULL;
+    }
+  }
 }
 
 // Try to find an icon with the name |icon_name| that's |size| pixels.
 FilePath LookupIconInDefaultTheme(const std::string& icon_name, int size) {
   EnsureUpdated();
   MimeUtilConstants* constants = Singleton<MimeUtilConstants>::get();
   std::map<std::string, IconTheme*>* icon_themes = constants->icon_themes;
   if (icon_themes->size() == 0)
     InitDefaultThemes();
 
@@ skipping 64 matching lines @@
     } else {
       icon_file = LookupIconInDefaultTheme(icon_names[i], size);
       if (!icon_file.empty())
         return icon_file;
     }
   }
   return FilePath();
 }
 
 }  // namespace mime_util