Make omaha, gcapi and uninstall registry accesses use Wow6432Node on 64-bit

chrome/installer/util/shell_util.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.
 //
 // This file defines functions that integrate Chrome in Windows shell. These
 // functions can be used by Chrome as well as Chrome installer. All of the
 // work is done by the local functions defined in anonymous namespace in
 // this class.
 
 #include "chrome/installer/util/shell_util.h"
@@ skipping 694 matching lines @@
                               const base::string16& protocol) {
   // Only user-level installs prior to Windows 8 should need to elevate to
   // register.
   DCHECK(InstallUtil::IsPerUserInstall(chrome_exe.c_str()));
   DCHECK_LT(base::win::GetVersion(), base::win::VERSION_WIN8);
   base::FilePath exe_path =
       base::FilePath(chrome_exe).DirName().Append(installer::kSetupExe);
   if (!base::PathExists(exe_path)) {
     HKEY reg_root = InstallUtil::IsPerUserInstall(chrome_exe.c_str()) ?
         HKEY_CURRENT_USER : HKEY_LOCAL_MACHINE;
-    RegKey key(reg_root, dist->GetUninstallRegPath().c_str(), KEY_READ);
+    RegKey key(reg_root, dist->GetUninstallRegPath().c_str(),
+               KEY_READ | KEY_WOW64_32KEY);

[grt (UTC plus 2), 2014/05/27 16:42:08]

i think this should be in the default; see other comments.

[Will Harris, 2014/05/27 19:25:10]

see general comment on 32/64 uninstall.

     base::string16 uninstall_string;
     key.ReadValue(installer::kUninstallStringField, &uninstall_string);
     CommandLine command_line = CommandLine::FromString(uninstall_string);
     exe_path = command_line.GetProgram();
   }
 
   if (base::PathExists(exe_path)) {
     CommandLine cmd(exe_path);
     cmd.AppendSwitchNative(installer::switches::kRegisterChromeBrowser,
                            chrome_exe);
@@ skipping 1542 matching lines @@
     // are any left...).
     if (free_bits >= 8 && next_byte_index < size) {
       free_bits -= 8;
       bit_stream += bytes[next_byte_index++] << free_bits;
     }
   }
 
   DCHECK_EQ(ret.length(), encoded_length);
   return ret;
 }