Remove some PlatformFile uses from NaCl.

BUG=322664
R=mseaborn@chromium.org, cpu@chromium.org

Review URL: https://codereview.chromium.org/165663002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255131 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255131
Blink roll 168490:168503

http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=/trunk&range=168491:168503&mode=html
TBR=
BUG=

Review URL: https://codereview.chromium.org/184293010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255133 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255135 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255135