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This CL removes overflow indicator in ScrollView in UnifiedSystemTray's
detailed views. As the corners are rounded, overflow indicator is not
shown properly.

TEST=manual
BUG=835733

Change-Id: I89e7e25a2529a354de9b258ba80697961e1c0745
Reviewed-on: https://chromium-review.googlesource.com/1075912
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562367}