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This CL removes the call to DeleteForCurrentDocument from the destructor
of ManifestManagerHost.

This intends to fix a crash which happens from time to time using
RenderDocumentHostUserData.

Change-Id: I1336fb62328dcb0cf9991499f399bf3665d29b75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224737Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Sreeja Kamishetty <sreejakshetty@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Yuzu Saijo <yuzus@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774006}