Reland r57575 - Remove the default argument from RegKey::Open.

chrome/browser/platform_util_win.cc

 // 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.
 
 #include "chrome/browser/platform_util.h"
 
 #include <commdlg.h>
 #include <dwmapi.h>
 #include <shellapi.h>
 #include <shlobj.h>
@@ skipping 95 matching lines @@
   // support URLS of 2083 chars in length, 2K is safe."
   const size_t kMaxUrlLength = 2048;
   if (escaped_url.length() > kMaxUrlLength) {
     NOTREACHED();
     return;
   }
 
   RegKey key;
   std::wstring registry_path = ASCIIToWide(url.scheme()) +
                                L"\\shell\\open\\command";
-  key.Open(HKEY_CLASSES_ROOT, registry_path.c_str());
+  key.Open(HKEY_CLASSES_ROOT, registry_path.c_str(), KEY_READ);
   if (key.Valid()) {
     DWORD size = 0;
     key.ReadValue(NULL, NULL, &size);
     if (size <= 2) {
       // ShellExecute crashes the process when the command is empty.
       // We check for "2" because it always returns the trailing NULL.
       // TODO(nsylvain): we should also add a dialog to warn on errors. See
       // bug 1136923.
       return;
     }
@@ skipping 49 matching lines @@
 
     GoogleUpdateSettings::GetChromeChannel(is_system_install, &channel);
   }
   return channel;
 #else
   return string16();
 #endif
 }
 
 }  // namespace platform_util