Modify the "dangerous download" algorithm as follows. Original patch by Pier...

chrome/browser/download/download_util.h

 // 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.
 //
 // Download utilities.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UTIL_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UTIL_H_
 #pragma once
 
@@ skipping 132 matching lines @@
 
 // Drag support ----------------------------------------------------------------
 
 // Helper function for download views to use when acting as a drag source for a
 // DownloadItem. If |icon| is NULL, no image will be accompany the drag. |view|
 // is only required for Mac OS X, elsewhere it can be NULL.
 void DragDownload(const DownloadItem* download,
                   SkBitmap* icon,
                   gfx::NativeView view);
 
-// Executable file support -----------------------------------------------------
-
-// Tests if a file is considered executable, based on its type.
-bool IsExecutableFile(const FilePath& path);
-
-// Determine if the specified extension is an executable extension.
-bool IsExecutableExtension(const FilePath::StringType& extension);
-
-// Tests if we think the server means for this mime_type to be executable.
-bool IsExecutableMimeType(const std::string& mime_type);
-
 // Helpers ---------------------------------------------------------------------
 
 // Creates a representation of a download in a format that the downloads
 // HTML page can understand.
 DictionaryValue* CreateDownloadItemValue(DownloadItem* download, int id);
 
 // Get the localized status text for an in-progress download.
 std::wstring GetProgressStatusText(DownloadItem* download);
 
 // Update the application icon to indicate overall download progress.
@@ skipping 42 matching lines @@
 
 // Returns a .crdownload intermediate path for the |suggested_path|.
 FilePath GetCrDownloadPath(const FilePath& suggested_path);
 
 // Whether a given download should be considered potentially dangerous.
 bool IsDangerous(DownloadCreateInfo *info, Profile* profile);
 
 }  // namespace download_util
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UTIL_H_