Revert 252466 "In order to support writing on windows we need to..."

Broke multiple MFYI bots (leaks, uninits). See issue.

> In order to support writing on windows we need to take advantage of the new privileged operation in the utility thread.  This code overlaps heavily with the Linux and OS X code, so all the writing for those is moved as well.
> 
> BUG=
> 
> Review URL: https://codereview.chromium.org/61643015

BUG=345659
TBR=haven@chromium.org

Review URL: https://codereview.chromium.org/175423004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252595 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252595