In Chromium, App Launcher's WM_CLASS is "chromium_app_list".

ui/app_list/views/app_list_view.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 "ui/app_list/views/app_list_view.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_util.h"
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_model.h"
@@ skipping 40 matching lines @@
 const int kSpeechUIMargin = 12;
 
 // The vertical position for the appearing animation of the speech UI.
 const float kSpeechUIApearingPosition =12;
 
 // The distance between the arrow tip and edge of the anchor view.
 const int kArrowOffset = 10;
 
 #if defined(OS_LINUX)
 // The WM_CLASS name for the app launcher window on Linux.
-const char* kAppListWMClass = "chrome_app_list";
+#if defined(GOOGLE_CHROME_BUILD)
+const char kAppListWMClass[] = "chrome_app_list";
+#else  // CHROMIUM_BUILD
+const char kAppListWMClass[] = "chromium_app_list";
+#endif
 #endif
 
 // Determines whether the current environment supports shadows bubble borders.
 bool SupportsShadow() {
 #if defined(USE_AURA) && defined(OS_WIN)
   // Shadows are not supported on Windows Aura without Aero Glass.
   if (!ui::win::IsAeroGlassEnabled() ||
       CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableDwmComposition)) {
     return false;
@@ skipping 391 matching lines @@
 #else
   speech_view_->SetVisible(recognizing);
   app_list_main_view_->SetVisible(!recognizing);
 #endif
 
   // Needs to schedule paint of AppListView itself, to repaint the background.
   SchedulePaint();
 }
 
 }  // namespace app_list