Fix Google3 build by updating pdf path after https://codereview.chromium.org/1781773002

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1802553003

Review URL: https://codereview.chromium.org/1802553003
1 file changed