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Similar to OutOfProcessInstance, this CL makes PdfViewWebPlugin a
derived class from PaintManager::Client, and adds an attribute
|paint_manager_| to it, so that PdfViewWebPlugin can use the current
PaintManager in the future.

Bug: 1099020
Change-Id: If0ec99e02a4e82a6ada049e499387e5d3df41a20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580523
Commit-Queue: Hui Yingst <nigi@chromium.org>
Reviewed-by: K. Moon <kmoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837296}