Deprecate base::SharedMemory's lock functionality.

BUG=345734
R=brettw@chromium.org
TBR=jar@chromium.org

Review URL: https://codereview.chromium.org/175183004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252933 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252933
Roll Skia DEPS to r13562

R=reed@google.com

Review URL: https://codereview.chromium.org/178033002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252934 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252935 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252935