Revert of network_time_tracker: add temporary time protocol. (patchset #27 id:520001 of https://codereview.chromium.org/1835823002/ )

Reason for revert:
Speculative; lots of browser tests started failing with leak reports, and all failing tests look network related. See
https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20%28dbg%29%281%29/builds/54004,
e.g.

[444:555:0506/185642:ERROR:leak_tracker.h(100)] #0 0x7fd9c5c00d0e
base::debug::StackTrace::StackTrace()
#1 0x00000186cf6f base::debug::LeakTracker<>::LeakTracker()
#2 0x0000018635bb SystemURLRequestContextGetter::SystemURLRequestContextGetter()
#3 0x000001865c21 IOThread::InitSystemRequestContext()
#4 0x000001865af5 IOThread::system_url_request_context_getter()
#5 0x000001a08b90 BrowserProcessImpl::system_request_context()
#6 0x000001ef00c4 safe_browsing::SafeBrowsingService::Initialize()
#7 0x000001a0c1b0 BrowserProcessImpl::CreateSafeBrowsingService()
#8 0x000001a0c022 BrowserProcessImpl::safe_browsing_service()

Original issue's description:
> network_time_tracker: add temporary time protocol.
>
> This adds queries of the temporary secure time server, with signature
> verification, and a very conservative scheduler.  (Checks once per hour,
> queries only if sync believed to be lost.)
>
> BUG=589700
>
> Committed: https://crrev.com/ee2016a374b73ba35508ae26837755a23b3defa4
> Cr-Commit-Position: refs/heads/master@{#392208}

TBR=estark@chromium.org,waffles@chromium.org,zea@chromium.org,sky@chromium.org,rohitrao@chromium.org,rsleevi@chromium.org,mmenke@chromium.org,rsesek@chromium.org,mab@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=589700

Review-Url: https://codereview.chromium.org/1956173002
Cr-Commit-Position: refs/heads/master@{#392264}
14 files changed