net/http: use Header.clone rather then duplicating functionality

cloneHeader duplicates what Header.clone() method is doing. It's
used in a single place, which can be replaced with the use of the
method.

Change-Id: I6e8bbd6c95063f31ca3695f13fa7478873230525
GitHub-Last-Rev: eb08aeae9b4257df5cf08d6d30903ddeec6b6242
GitHub-Pull-Request: golang/go#27817
Reviewed-on: https://go-review.googlesource.com/136762
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2 files changed
tree: eda1a3434004f3978ac5ef975821379eb02f6a91
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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