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Have the BidiRunList destructor delete all runs and change all
BidiRunList call sites, except RenderBlockLineLayout, to rely on the
destructor instead of explicit calls to deleteRuns.

In RenderBlockFlow::layoutRunsAndFloatsInRange deleteRuns is called
early, and explicitly, in two places. Removing these calls would likely
involve splitting the run list of changing the life time of it.

BUG=396963
R=dglazkov@chromium.org

Review URL: https://codereview.chromium.org/421463002

git-svn-id: svn://svn.chromium.org/blink/trunk@179177 bbb929c8-8fbe-4397-9dbb-9b2b20218538