Windows: Convert mime types to lowercase in GetPlatformMimeTypeFromExtension.

net/base/platform_mime_util_win.cc

 // 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.
 
 #include "net/base/platform_mime_util.h"
 
 #include <string>
 
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/registry.h"
 
 namespace net {
 
 bool PlatformMimeUtil::GetPlatformMimeTypeFromExtension(
     const base::FilePath::StringType& ext, std::string* result) const {
   // check windows registry for file extension's mime type (registry key
   // names are not case-sensitive).
   std::wstring value, key = L"." + ext;
   base::win::RegKey(HKEY_CLASSES_ROOT, key.c_str(), KEY_READ).ReadValue(
       L"Content Type", &value);
   if (!value.empty()) {
-    *result = base::WideToUTF8(value);
+    *result = base::ToLowerASCII(base::WideToUTF8(value));
     return true;
   }
   return false;
 }
 
 bool PlatformMimeUtil::GetPreferredExtensionForMimeType(
     const std::string& mime_type, base::FilePath::StringType* ext) const {
   std::wstring key(
       L"MIME\\Database\\Content Type\\" + base::UTF8ToWide(mime_type));
   if (base::win::RegKey(HKEY_CLASSES_ROOT, key.c_str(), KEY_READ).ReadValue(
@@ skipping 13 matching lines @@
   // Multiple extensions could have the given mime type specified as their types
   // in their 'HKCR\.<extension>\Content Type' keys. Iterating all the HKCR
   // entries, though, is wildly impractical. Cheat by returning just the
   // preferred extension.
   base::FilePath::StringType ext;
   if (GetPreferredExtensionForMimeType(mime_type, &ext))
     extensions->insert(ext);
 }
 
 }  // namespace net