Speculative fix for EmbeddedObjectPainter::paintReplaced crash
Speculative fix for EmbeddedObjectPainter::paintReplaced crash

The crash was due to FontFallbackList::determinePrimarySimpleFontData returning
a null font data. It is not clear how could this ever happen. A null check is
added as a stopgap solution.

BUG=481880

Review URL: https://codereview.chromium.org/1112983002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@194774 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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