This whitespace different is thought to be breaking
the build.

The differences in white space are hypothesized to happen
because trailing whitespace is chomped by some people's
editors but not others.

The trailing whitespace is enough of a difference to make
hack/verify-api-references-docs.sh think that the
docs are not different.

I think this is not caught by presubmits because different
versions of diff are doing different things with trailing
whitespace, even though `-Bw` flags are passed.