GitLab

The NSFont object could be nil, which would have a NULL font name, which when
converted to a std::string would cause a crash. The font name is already in the
FontDescriptor, so it's entirely unnecessary.

BUG=452651
R=avi@chromium.org

Review URL: https://codereview.chromium.org/969683003

Cr-Commit-Position: refs/heads/master@{#318911}