Add a flag to all of the registry related work items to specify whether to operate on the 64-bit or 32-bit hive on a WOW64 system.

Make DeleteRegKeyWorkItem call down into RegKey so WOW64 support works for delete work items.

All calls changed to use the Wow64_Default (0) parameter, so the behavior is identical.

This is prep for adding 64-bit support to the installer.

BUG=348626,338706
R=grt@chromium.org, grt
TBR=sky
TEST=installer_util_unittests

Review URL: https://codereview.chromium.org/282363003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272539 0039d316-1c4b-4281-b951-d872f2087c98
39 files changed