For hash_map and hash_set, we should include "base/hashtables.h", not
the <hash_set> or <hash_map> standard headers.

R=maruel@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/14139002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@194047 0039d316-1c4b-4281-b951-d872f2087c98