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This reverts commit d0de1771.

Reason for revert: speculative revert, this might cause hangs on Linux component builds due to linker symbol resolution issues.

Original change's description:
> [CFI] Use ProtectedMemory in CertVerifyProcNSS
> 
> Because CertVerifyProcNSS dynamically resolves a pointer to the function
> CERT_CacheOCSPResponseFromSideChannel(), Control Flow Integrity [1]
> indirect call (cfi-icall) checking can not verify that it is the
> intended target for that function pointer call site.
> 
> Since we can not use cfi-icall to check the function pointer, instead we
> place the pointer in ProtectedMemory, a wrapper for keeping variables in
> read-only memory except for when they are initialized. After setting the
> pointer in protected memory we can use the UnsanitizedCfiCall wrapper to
> disable cfi-icall checking when calling it since we know it can not be
> tampered with.
> 
> [1] https://www.chromium.org/developers/testing/control-flow-integrity
> 
> Bug: 771365
> Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
> Change-Id: I5d65b3591681f3daa917b6516eec1e5e47513d12
> Reviewed-on: https://chromium-review.googlesource.com/765098
> Reviewed-by: Peter Collingbourne <pcc@chromium.org>
> Reviewed-by: Eric Roman <eroman@chromium.org>
> Commit-Queue: Peter Collingbourne <pcc@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#517169}

TBR=eroman@chromium.org,pcc@chromium.org,vtsyrklevich@chromium.org

Change-Id: I2d9a65fd6284c2cf954b46588d70fd1fa6292014
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 771365
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Reviewed-on: https://chromium-review.googlesource.com/775595Reviewed-by: Peter Collingbourne <pcc@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517223}