[chromedriver] Resume if the debugger is paused by a JS 'debugger' statement.
BUG=chromedriver:545
R=chrisgao@chromium.org

Review URL: https://codereview.chromium.org/25039008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226107 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226107