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Rather than duplicate the logic in cdm_paths.cc, pass
cdm_platform_specific_path from cdm_paths.gni using BUILDFLAGS.

Bug: 971433
Test: EME browser_tests pass
Change-Id: I0cdfb768b36e991fc407291093ee00bf3cd5cffa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1747197
Commit-Queue: John Rummell <jrummell@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687369}