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Per spec there is no default padding for text track cue rendering.
Removing the default padding for cue text.

BUG=930608, 843136

Change-Id: If931c1faff528a87d8a78808f30225ebe2377072
Reviewed-on: https://chromium-review.googlesource.com/c/1475567
Commit-Queue: srirama chandra sekhar <srirama.m@samsung.com>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#633624}