GitLab

RenderMessageFilter used to be responsible for cloning session storage
namespaces, but that is no longer the case, so remove these leftover
bits of code.

Bug: none
Change-Id: I382be562164851a8b00601661635e76495bbcbb2
Reviewed-on: https://chromium-review.googlesource.com/1099997Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567404}