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This reverts commit e4dbb92e.

Reason for revert: Should no longer be needed after sysroot roll:
https://chromium-review.googlesource.com/c/chromium/src/+/2219606

Original change's description:
> Add -Wl,--allow-shlib-undefined to some executables.
> 
> Due to https://reviews.llvm.org/D80059, a hack for unversioned libdbus symbols
> no longer works. This adds --allow-shlib-undefined for the dependent
> executables when llvm_force_head_revision is enabled to green the ToT bots.
> 
> Bug: 1086636
> Change-Id: I78a5d1a56953c1a5cb5694f299080bdeee0726d2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2220350
> Commit-Queue: Amy Huang <akhuang@google.com>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#772912}

TBR=thakis@chromium.org,akhuang@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1086636
Change-Id: I3e9bcea3eea6e881f66b4822e2750d1fccdd4516
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2223011Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773436}