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Rename SignallingSender to SignalingSender to use the same naming as the spec.

Bug: 1044584
Change-Id: Ieef65c03931f159f05019ee0799c789320bc164d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2331762Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Richard Knoll <knollr@chromium.org>
Commit-Queue: Zhuoyu Qian <zhuoyu.qian@samsung.com>
Cr-Commit-Position: refs/heads/master@{#794780}