Content shell/GTK: Add JavaScript dialog support.

content/shell/shell_javascript_dialog_creator.h

 // 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.
 
 #ifndef CONTENT_SHELL_SHELL_JAVASCRIPT_DIALOG_CREATOR_H_
 #define CONTENT_SHELL_SHELL_JAVASCRIPT_DIALOG_CREATOR_H_
 
 #include "base/compiler_specific.h"
 #include "base/callback_forward.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 30 matching lines @@
   // Called by the ShellJavaScriptDialog when it closes.
   void DialogClosed(ShellJavaScriptDialog* dialog);
 
   // Used for content_browsertests.
   void set_dialog_request_callback(
       base::Callback<void()> dialog_request_callback) {
     dialog_request_callback_ = dialog_request_callback;
   }
 
  private:
-#if defined(OS_MACOSX) || defined(OS_WIN)
+#if defined(OS_MACOSX) || defined(OS_WIN) || defined(OS_LINUX)
   // The dialog being shown. No queueing.
   scoped_ptr<ShellJavaScriptDialog> dialog_;
 #else
   // TODO: implement ShellJavaScriptDialog for other platforms, drop this #if
 #endif
 
   base::Callback<void()> dialog_request_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellJavaScriptDialogCreator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_SHELL_JAVASCRIPT_DIALOG_CREATOR_H_