Revert of Enable Control Flow Integrity for the official Linux Chrome. (patchset #1 id:1 of https://codereview.chromium.org/1501593003/ )

Reason for revert:
Buildbot timed out:
https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Linux%20x64/builds/6284

"command timed out: 3600 seconds without output, attempting to kill"

It's hard to say why does the buildbot so much slower than a local build. Possibly, not enough RAM.

Original issue's description:
> Enable Control Flow Integrity for the official Linux Chrome.
>
> This CL turns on CFI, a security check:
> https://sites.google.com/a/chromium.org/dev/developers/testing/control-flow-integrity
> http://clang.llvm.org/docs/ControlFlowIntegrity.html
>
> This feature enables LTO (Link-Time Optimization) builds, which slow down the linker by 3x-4x.
> CFI also comes with a code size overhead of about 7%-9%. The runtime CPU cost is less than 1%,
> and should not be an issue.
>
> BUG=chromium:464797
> Intent to Implement thread:
> https://groups.google.com/a/chromium.org/d/msg/chromium-dev/pbJqt6ccMII/7iJC2oklCAAJ
>
> This is a second attempt to land the CL. The first one:
> https://codereview.chromium.org/1393283005/
>
> Committed: https://crrev.com/abbfcc7930834381e05c31068ac2256cb9ea4f49
> Cr-Commit-Position: refs/heads/master@{#363267}

TBR=thakis@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:464797

Review URL: https://codereview.chromium.org/1501873002

Cr-Commit-Position: refs/heads/master@{#363313}
2 files changed