replace COMPILE_ASSERT with static_assert in net/

net/dns/dns_session.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/dns/dns_session.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/metrics/histogram.h"
@@ skipping 254 matching lines @@
   unsigned num_backoffs = attempt / config_.nameservers.size();
 
   return std::min(timeout * (1 << num_backoffs),
                   base::TimeDelta::FromMilliseconds(kMaxTimeoutMs));
 }
 
 base::TimeDelta DnsSession::NextTimeoutFromHistogram(unsigned server_index,
                                                      int attempt) {
   DCHECK_LT(server_index, server_stats_.size());
 
-  COMPILE_ASSERT(std::numeric_limits<base::HistogramBase::Count>::is_signed,
-                 histogram_base_count_assumed_to_be_signed);
+  static_assert(std::numeric_limits<base::HistogramBase::Count>::is_signed,
+                "histogram base count assumed to be signed");
 
   // Use fixed percentile of observed samples.
   const base::SampleVector& samples =
       *server_stats_[server_index]->rtt_histogram;
 
   base::HistogramBase::Count total = samples.TotalCount();
   base::HistogramBase::Count remaining_count = kRTOPercentile * total / 100;
   size_t index = 0;
   while (remaining_count > 0 && index < rtt_buckets_.Get().size()) {
     remaining_count -= samples.GetCountAtIndex(index);
     ++index;
   }
 
   base::TimeDelta timeout =
       base::TimeDelta::FromMilliseconds(rtt_buckets_.Get().range(index));
 
   timeout = std::max(timeout, base::TimeDelta::FromMilliseconds(kMinTimeoutMs));
 
   // The timeout still doubles every full round.
   unsigned num_backoffs = attempt / config_.nameservers.size();
 
   return std::min(timeout * (1 << num_backoffs),
                   base::TimeDelta::FromMilliseconds(kMaxTimeoutMs));
 }
 
 }  // namespace net