DevTools: Add kaznacheev@ and vsevik@ to OWNERS

Adding kaznacheev@ and vsevik@ to chrome/browser/devtools/OWNERS and content/browser/devtools/OWNERS

BUG=None
R=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/32643003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229855 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229855