Revert of Statically link libprotobuf_lite on Linux (patchset #2 id:20001 of https://codereview.chromium.org/2746493002/ )

Reason for revert:
Not sure why, but it looks this starts to cause CloudPolicyManagerTest failures.

(Confirmed that locally reverting this CL fixed them)

https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20%28dbg%29%281%29%2832%29/builds/39213

https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20%28dbg%29%281%29%2832%29/builds/39214

CloudPolicyManagerTest.Register
CloudPolicyManagerTest.RegisterWithRetry
failed to process gtest output JSON
CloudPolicyProtoTest.VerifyProtobufEquivalence

Original issue's description:
> Statically link libprotobuf_lite on Linux
>
> Chrome has a direct dependency on a custom libprotobuf_lite in
> third_party, but Xenial and Yakkety add a dependency on the system
> libprotobuf-lite via Mir (which gets loaded from Gtk).
>
> Our third_party protobuf is not compatible with the upstream protobuf.
> Combine this with the fact that Xenial uses version 2 while Yakkety
> uses version 3, and it's basically impossible to make our third_party
> protobuf cooperate with the system one.  The solution is to always
> statically link protobuf on Linux.
>
> BUG=79722,700120
> R=pkasting@chromium.org
> TBR=bengr@chromium.org
> CC=dpranke@chromium.org,rsimha@chromium.org
>
> Review-Url: https://codereview.chromium.org/2746493002
> Cr-Commit-Position: refs/heads/master@{#455936}
> Committed: https://chromium.googlesource.com/chromium/src/+/4af1264005620a483a209f4344c3782f62eee69a

TBR=pkasting@chromium.org,bengr@chromium.org,thomasanderson@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=79722,700120

Review-Url: https://codereview.chromium.org/2739203004
Cr-Commit-Position: refs/heads/master@{#456013}
2 files changed