MarkupAccumulator: Remove XML namespace check.

Now RetrievePreferredPrefixString() correctly chooses 'xml' prefix for
the XML namespace. So this check is unnecessary.

This CL has no behavior changes.

Change-Id: I9fe1d6ab0d9209bb5a09e85e2df0c563996b7734
Reviewed-on: https://chromium-review.googlesource.com/c/1469841
Commit-Queue: Kent Tamura <tkent@chromium.org>
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Auto-Submit: Kent Tamura <tkent@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631606}
1 file changed