GitLab

This reverts commit d2cc1555.

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

Original change's description:
> [cfi-icall] Use ProtectedMemory for GetProcAddress
> 
> Control Flow Integrity [1] indirect call (cfi-icall) checking can not
> verify that dynamically resolved function pointers call their intended
> function. Instead we place the pointer for GLGetProcAddress 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_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> Change-Id: Ia79c1cfab8e00f88bcc437c34cbb3012537c015a
> Reviewed-on: https://chromium-review.googlesource.com/769654
> Commit-Queue: Peter Collingbourne <pcc@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Reviewed-by: Peter Collingbourne <pcc@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#517208}

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

Change-Id: Ia474d99619795f9b2c40422858caf2a02461e462
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 771365
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/775596Reviewed-by: Peter Collingbourne <pcc@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517224}