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This patch changes "tools/win/DebugVisualizers/webkit.natvis" to handle
new |StringImpl| implementation[1].

I confirmed this change for both 8-Bit string and 16-Bit string, e.g.
8-Bit for |Element::tag_name| via (AtomicString), 16-Bit
|NGInlineNodeData::text_content_|.

Note: We use type cast operator to read |std::atomic_uint32_t|, because
DebugVisualizers can't read value from struct field for it.

[1] http://crrev.com/c/2301589 Make StringImpl flags atomic and
threadsafe

Bug: 1083392
Change-Id: I559ff4619695c1a4b1f5d330c36df2e85149c5c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309528
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Auto-Submit: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792511}