Jason Simmons 2db913d253 Fix a leak of RenderObjects in Paragraph/ParagraphBuilder (flutter/engine#3189)
The RenderView destructor does not delete its descendants.
RenderObject::destroy must be called to delete the object tree along with
other cleanup tasks.

Also associate a CustomFontData with dynamically loaded fonts in order to get
the desired FontDataCache behavior at RenderObject::destroy time.
2016-10-31 11:16:04 -07:00
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