Remove prefixed CSS Variable token (missed in first unprefixing)

"-webkit-var" is still being interpeted by the parser as a token even
though CSS variables should have been unprefixed.

BUG=244352

Review URL: https://chromiumcodereview.appspot.com/19738002

git-svn-id: svn://svn.chromium.org/blink/trunk@154477 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove MemoryAgent.getProcessMemoryDistribution

This removes more code related to native memory instrumentation.

BUG=234422,261362
R=alph@chromium.org

Review URL: https://codereview.chromium.org/19751002

git-svn-id: svn://svn.chromium.org/blink/trunk@154478 bbb929c8-8fbe-4397-9dbb-9b2b20218538