Set the WM_CLASS property of X11 windows in Linux Aura build.

chrome/browser/web_applications/web_app.cc

 // Copyright (c) 2012 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/web_applications/web_app.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/i18n/file_util_icu.h"
@@ skipping 210 matching lines @@
     // We only take square shaped icons (i.e. width == height).
     if (app_info.icons[i].width == app_info.icons[i].height) {
       icons->push_back(app_info.icons[i]);
     }
   }
 
   std::sort(icons->begin(), icons->end(), &IconPrecedes);
 }
 #endif
 
-#if defined(TOOLKIT_GTK)
 std::string GetWMClassFromAppName(std::string app_name) {
   file_util::ReplaceIllegalCharactersInPath(&app_name, '_');
   TrimString(app_name, "_", &app_name);
   return app_name;
 }
-#endif
 
 string16 GetAppShortcutsSubdirName() {
   chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
   if (channel == chrome::VersionInfo::CHANNEL_CANARY)
     return l10n_util::GetStringUTF16(IDS_APP_SHORTCUTS_SUBDIR_NAME_CANARY);
   return l10n_util::GetStringUTF16(IDS_APP_SHORTCUTS_SUBDIR_NAME);
 }
 
 }  // namespace web_app