fix linux build

chrome/browser/dom_ui/app_launcher_handler.cc

 // Copyright (c) 2010 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/dom_ui/app_launcher_handler.h"
 
 #include "app/resource_bundle.h"
 #include "base/base64.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 112 matching lines @@
   if (launch_container.empty()) {
     Browser::OpenApplication(profile, extension_id);
     return;
   }
 
   // Override the default launch container.
   Extension* extension =
       extensions_service_->GetExtensionById(extension_id, false);
   DCHECK(extension);
 
-  Extension::LaunchContainer container;
+  Extension::LaunchContainer container = Extension::LAUNCH_TAB;
   if (launch_container == "tab")
     container = Extension::LAUNCH_TAB;
   else if (launch_container == "panel")
     container = Extension::LAUNCH_PANEL;
   else if (launch_container == "window")
     container = Extension::LAUNCH_WINDOW;
   else
     NOTREACHED() << "Unexpected launch container: " << launch_container << ".";
 
   Browser::OpenApplication(profile, extension, container);
 }