Show dangerous file type warning on Linux and Mac.

chrome/browser/safe_browsing/download_protection_service.cc

 // Copyright (c) 2011 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/safe_browsing/download_protection_service.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/format_macros.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 719 matching lines @@
       new DownloadUrlSBClient(info, callback, sb_service_));
   // The client will release itself once it is done.
   BrowserThread::PostTask(
         BrowserThread::IO,
         FROM_HERE,
         base::Bind(&DownloadUrlSBClient::StartCheck, client));
 }
 
 bool DownloadProtectionService::IsSupportedFileType(
     const FilePath& filename) const {
+  // Currently, the UI only works on Windows.  On Linux and Mac we still
+  // want to show the dangerous file type warning if the file is possibly
+  // dangerous which means we have to always return false here.
+#if defined(OS_WIN)
   return IsBinaryFile(filename);
+#else
+  return false;
+#endif
 }
 
 void DownloadProtectionService::CancelPendingRequests() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   for (std::set<scoped_refptr<CheckClientDownloadRequest> >::iterator it =
            download_requests_.begin();
        it != download_requests_.end();) {
     // We need to advance the iterator before we cancel because canceling
     // the request will invalidate it when RequestFinished is called below.
     scoped_refptr<CheckClientDownloadRequest> tmp = *it++;
@@ skipping 80 matching lines @@
 
   std::string issuer_fp = base::HexEncode(issuer.fingerprint().data,
                                           sizeof(issuer.fingerprint().data));
   for (std::set<std::string>::iterator it = paths_to_check.begin();
        it != paths_to_check.end(); ++it) {
     whitelist_strings->push_back("cert/" + issuer_fp + *it);
   }
 }
 
 }  // namespace safe_browsing