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The test was taking too much time in debug mode.
This CL improves the time needed to test by not editing the session using the UI.

Change-Id: I9809dc08b15deb988f3bbc09b00d3f4ba0a5eda8
Reviewed-on: https://chromium-review.googlesource.com/1042998
Commit-Queue: Martin Rodriguez <rodmartin@google.com>
Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Georges Khalil <georgesak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556180}