Drop the document.charset part of fast/encoding/external-script-charset.xhtml

Drop the document.charset part of fast/encoding/external-script-charset.xhtml

Simplify to only test the inheritance, but use the koi8-r for the XHTML
document to ensure that it's not just the default encoding being used to
decode the script.

The bots cannot apply this patch because of the encoding of
LayoutTests/fast/encoding/external-script-charset-koi-8.js.

BUG=438392
R=pdr@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195595

[philipj_slow, 2015-05-19 22:53:21]

philipj@opera.com changed reviewers:
+ pdr@chromium.org

[philipj_slow, 2015-05-19 22:53:22]

PTAL. I'm doing this separately before the bigger CL to make document.charset
readonly, as I think the only way I'll be able to land this is with dcommit. It
passes locally, and presumably the only way you could be confident is by doing
the same. Am I missing something?

[pdr., 2015-05-19 23:28:33]

LGTM

git cl dcommit away

[philipj_slow, 2015-05-20 07:43:38]

Committed patchset #1 (id:1) manually as 195595 (presubmit successful).