Update PdfOcrControllerTest.

Two disabled tests are updated and enabled and a new test is added for
SelectToSpeak.

AX-Relnotes: n/a
Bug: 341856144
Change-Id: I392e545b609a144798ce99f8a03ba7b73b92c158
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5601477


Auto-Submit: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Abigail Klein <abigailbklein@google.com>
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/main@{#1312765}