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This CL re-implements the named test so that it is meaningful in the
context of OOPIF-based PDFs. The test (i) verifies that the embedder loads
correct boilerplate <embed> tag, and (ii) that the extension loads.

Bug: 1019367
Change-Id: I79193923d2b0572bd49bf75cb462f2db8768a901
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906181
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714699}