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This CL switch only imported header file to unblock WebRTC refactoring
to move sigslot target to proper location. But it is required that
all usages of sigslot will be eliminated from chromium code base. Here
is a ticket to track this effort: https://crbug.com/867820

Bug: 867820, webrtc:8366
Change-Id: I431a178048886833b8bbd8508ce5a3937997f5ab
Reviewed-on: https://chromium-review.googlesource.com/1150537Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Commit-Queue: Artem Titov <titovartem@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579340}