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This CL makes the calls to GetSessionList and DoRenameSession safe as
was noted in CL 929754.

Bug: 830913
Change-Id: I7ad22b5712e032f256bd46ae9f04c28255861af7
Reviewed-on: https://chromium-review.googlesource.com/996472
Commit-Queue: Martin Rodriguez <rodmartin@google.com>
Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549532}