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Currently whitespaces can not be shown in the built-in XML Viewer.
It is proper to remove trim in text node creation for whitespaces show.

Bug: 736690
Signed-off-by: Yuhong Sha <yuhong.sha@samsung.com>
Change-Id: I55ca0f61d76f3a45a9dabdd0b5805a2e895e1fc2
Reviewed-on: https://chromium-review.googlesource.com/950489
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543342}