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This reverts commit 68d3758b.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 801909 as the
culprit for failures in the build cycles as shown on:
https://analysis.chromium.org/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtLzY4ZDM3NThiMDEwZGMzZGIxN2NkNWU1MzdmMDAxNGE0N2Y0MDI5MDYM

Sample Failed Build: https://ci.chromium.org/b/8870873385800887712

Sample Failed Step: compile

Original change's description:
> [base] Use getrandom on Linux.
> 
> Fall back to reading from urandom only when that fails.
> 
> Bug: 995996
> Change-Id: Id503ca2dc412a392d5a7e252fcfff65b61d0c20e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762604
> Commit-Queue: Chris Palmer <palmer@chromium.org>
> Reviewed-by: Julien Tinnes <jln@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Robert Sesek <rsesek@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#801909}


Change-Id: If682cc741bd401fc6ab2a3e9e8173ac8e20d6e75
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 995996
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377418
Cr-Commit-Position: refs/heads/master@{#801937}