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AwPrintManager and PrintViewManagerBasic are the only subclasses of
PrintManager that use |pdf_writing_done_callback_|. The two classes do
not interact with one another, and no other code changes
|pdf_writing_done_callback_|. Given this, since both classes initializes
|pdf_writing_done_callback_|, there is no need to check if the callback
is null.

Change-Id: I73c8a309e3cb7fde0286950e0ef2be2211881373
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885108
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710494}