Add a gyp flag for disabling sse2.  This makes it easier for distros to disable sse2.
Add a gyp flag for disabling sse2.  This makes it easier for
distros to disable sse2.

Review URL: http://codereview.chromium.org/1702009

git-svn-id: http://src.chromium.org/svn/trunk/src@45777 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 51886483274aeb0ea968801e3c78f8c0e3be3809
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser