wstring: remove wstring version of SplitString

Retry of r84336.

BUG=23581

Review URL: http://codereview.chromium.org/6930047

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@84355 0039d316-1c4b-4281-b951-d872f2087c98
void Label::SetMultiLine(bool multi_line) {
  DCHECK(!multi_line || !elide_in_middle_);
  if (multi_line != is_multi_line_) {
    is_multi_line_ = multi_line;
    text_size_valid_ = false;
    PreferredSizeChanged();
    SchedulePaint();
  }
}

void Label::SetMultiLine(bool multi_line) {
  DCHECK(!multi_line || !elide_in_middle_);
  if (multi_line != is_multi_line_) {
    is_multi_line_ = multi_line;
    text_size_valid_ = false;
    PreferredSizeChanged();
    SchedulePaint();
  }
}
