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This fixes the build with libstdc++ (with most other standard libraries
other than libc++, in fact) after commit f93a48e3 ("Allow upgrade to DoH
during automatic mode"):

../../../../../../usr/bin/../lib/gcc/x86_64-redhat-linux/8/../../../../include/c++/8/bits/stl_vector.h:351:7: error: static_assert failed due to requirement 'is_same<typename remove_cv<const DohUpgradeEntry>::type, const DohUpgradeEntry>::value' "std::vector must have a non-const, non-volatile value_type"
      static_assert(is_same<typename remove_cv<_Tp>::type, _Tp>::value,
      ^             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../base/no_destructor.h:77:28: note: in instantiation of template class 'std::vector<const net::(anonymous namespace)::DohUpgradeEntry, std::allocator<const net::(anonymous namespace)::DohUpgradeEntry> >' requested here
  alignas(T) char storage_[sizeof(T)];
                           ^
../../net/dns/dns_util.cc:147:7: note: in instantiation of template class 'base::NoDestructor<std::vector<const net::(anonymous namespace)::DohUpgradeEntry, std::allocator<const net::(anonymous namespace)::DohUpgradeEntry> > >' requested here
      upgradable_servers({
      ^
../../net/dns/dns_util.cc:230:36: error: invalid range expression of type 'const std::vector<const net::(anonymous namespace)::DohUpgradeEntry, std::allocator<const net::(anonymous namespace)::DohUpgradeEntry> >'; no viable 'begin' function available
    for (const auto& upgrade_entry : upgradable_servers) {
                                   ^ ~~~~~~~~~~~~~~~~~~

The C++ standard forbids containers of const elements. Callers of
GetDohUpgradeList() use it in a safe way anyway, and most of
DohUpgradeEntry's members are const.

Bug: 957519
Change-Id: I826a51823edb1184c0fae27105101e2894efe568
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1805636
Auto-Submit: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Commit-Queue: Eric Orth <ericorth@chromium.org>
Reviewed-by: Eric Orth <ericorth@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696834}