Adding myself to the OWNERS file for WTF

I've been regularily contributing to WTF for about 1 year already - basically
from the Blink birth - and I'm one of the most active contributors there (around 80 commits in wtf/ folder, mostly to smart pointers and containers classes).

Recent WTF contributions
https://codereview.chromium.org/253753004/ MessageQueue uses Deque<OwnPtr<> >
https://codereview.chromium.org/252633005/ Enable WTF::HashSet<OwnPtr<> >
https://codereview.chromium.org/249363002/ Use macros instead of specializing VectorTraits explicitly
https://codereview.chromium.org/240213009/ Introduce a macro enabling 'SimpleClassVectorTraits'

The list of all my WTF contributions
http://svnsearch.org/svnsearch/repos/BLINK/search?from=20130402&path=%2Ftrunk%2FSource%2Fwtf&author=mikhail.pozdnyakov%40intel.com

Reviewing of WTF patches
https://codereview.chromium.org/256743005/ Add removeAll method.
https://codereview.chromium.org/228403002/ Prevent buggy use of swap and operator= on vectors
https://codereview.chromium.org/223373002/ Add LinkedHashSet collection
https://codereview.chromium.org/219413002/ Check for concurrent modification

NOTRY=true

Review URL: https://codereview.chromium.org/255123003

git-svn-id: svn://svn.chromium.org/blink/trunk@172989 bbb929c8-8fbe-4397-9dbb-9b2b20218538