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The crash may occur when dragging an item for reparant in root level
while we need to add a page break item between two items in root level.
The two items happened to have the same position which triggers a
position fix causing a LoadFromMetadata() call during SaveToMetadata().

Changes:
Remove observer when add page break item.

Bug: 900427
Change-Id: Ie416eeb81de47cd531a6c25a16761ce1d141847f
Reviewed-on: https://chromium-review.googlesource.com/c/1313054Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Weidong Guo <weidongg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604970}