Disable partial swap on Windows.

Partial swap may be causing some performance problems, so disable it.

BUG=313104

Review URL: https://codereview.chromium.org/79643002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236475 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 236475