DevTools: completely remove native memory instrumentation

Current approach doesn't work properly.
It covers about 70% of memory.
It affects binary size ~600Kb.
It doesn't scale because the binary size.
It is fragile.

BUG=234422
TBR=yurys@chromium.org

Review URL: https://codereview.chromium.org/19553002

git-svn-id: svn://svn.chromium.org/blink/trunk@154395 bbb929c8-8fbe-4397-9dbb-9b2b20218538