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This patch is a follow-up to CL 1676167, found in [1], and introduces
minor mechanical changes to the DecodeNode() method so that GUID
validity is only checked for bookmarks that are not of type
BookmarkPermanentNode.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/1676167

Bug: 978430
Change-Id: I44ba7699482c229bb9c651d5b213e68036c9d233
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1728883Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Pauline Leitao <psivieroleitao@google.com>
Cr-Commit-Position: refs/heads/master@{#689533}