SkPDF: PDFDevice use SkTArray<T> rather than SkTDArray<T*>

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1767713002

Review URL: https://codereview.chromium.org/1767713002
3 files changed