Remove 2 members from webpreference

Sticky position and CSS 3 shaders have been changed to
be runtime enabled feature and thus piggy-back on top
of the experimental web platform features.

This change remove the 2 previous preference along
with the associated code.

BUG=None

Review URL: https://codereview.chromium.org/27072003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228540 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228540
Roll icu deps from r224814 to r228516.

The only change in this roll should be r228516
as r224814 was the previous change to icu.

R=jshin@chromium.org

Review URL: https://codereview.chromium.org/27239002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228541 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228542 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228541
SVN changes up to revision 228542