Editing pass through Technical Overview and NaCl/PNaCl comparison ahead of Chrome M31 beta blog post announcement.

STAGED DOCS:

https://devsite.googleplex.com/native-client/pnacl-preview/overview

https://devsite.googleplex.com/native-client/pnacl-preview/nacl-and-pnacl

R=eliben@chromium.org, mackinlay@google.com

Review URL: https://codereview.chromium.org/25855002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227355 0039d316-1c4b-4281-b951-d872f2087c98
Roll Skia DEPS to r11637

Review URL: https://codereview.chromium.org/26344002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227356 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227357 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227356
SVN changes up to revision 227357