Change VTTCue to use non-paragraph directionality
Change VTTCue to use non-paragraph directionality

Change VTTCue to call BidiResolver::determineDirectionality rather than
the paragraph aware version as it should base the directionality on the
first code-point with directionality regardless of leading line breaks.

BUG=477220
R=kojii@chromium.org

Review URL: https://codereview.chromium.org/1141733004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@195390 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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