Disabling hidpi for pepper pdf on Windows.
Lack of scaled resources on Windows was causing the crash mentioned in the bug.

BUG=338050
R=dmichael,cpu

Review URL: https://codereview.chromium.org/137623010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247354 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247354