strings: use the builtin max function
Change-Id: I9093c0ce822f0620152a7b911321c57bc50dc90b
GitHub-Last-Rev:
dc6be231b315262e13925814b16786618ef5dad4
GitHub-Pull-Request: golang/go#61807
Reviewed-on: https://go-review.googlesource.com/c/go/+/516615
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>