Support dragging a virtual file out of the browser.

chrome/browser/download/download_exe.cc

 // Copyright (c) 2006-2008 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 <set>
 #include <string>
 
 #include "chrome/browser/download/download_util.h"
 
 #include "base/logging.h"
+#include "base/string_util.h"
 
 namespace download_util {
 
 // For file extensions taken from mozilla:
 
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
@@ skipping 130 matching lines @@
   "pl",
   "py",
   "rb",
   "sh",
 #elif defined(OS_MACOSX)
   // TODO(thakis): Figure out what makes sense here -- crbug.com/19096
   "dmg",
 #endif
 };
 
-void InitializeExeTypes(std::set<std::string>* exe_extensions) {
-  DCHECK(exe_extensions);
-  for (size_t i = 0; i < arraysize(g_executables); ++i)
-    exe_extensions->insert(g_executables[i]);
+bool IsExecutableExtension(const std::string& extension) {
+  for (size_t i = 0; i < arraysize(g_executables); ++i) {
+    if (LowerCaseEqualsASCII(extension, g_executables[i]))
+      return true;
+  }
+  return false;
 }
 
 }  // namespace download_util