[UMA] Remove redundant bucket_count variable from base::Histogram.

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 46 matching lines @@
   scoped_ptr<base::SampleVector> rtt_histogram;
 
   DISALLOW_COPY_AND_ASSIGN(ServerStats);
 };
 
 // static
 base::LazyInstance<DnsSession::RttBuckets>::Leaky DnsSession::rtt_buckets_ =
     LAZY_INSTANCE_INITIALIZER;
 
 DnsSession::RttBuckets::RttBuckets() : base::BucketRanges(kRTTBucketCount + 1) {
-  base::Histogram::InitializeBucketRanges(1, 5000, kRTTBucketCount, this);
+  base::Histogram::InitializeBucketRanges(1, 5000, this);
 }
 
 DnsSession::SocketLease::SocketLease(scoped_refptr<DnsSession> session,
                                      unsigned server_index,
                                      scoped_ptr<DatagramClientSocket> socket)
     : session_(session), server_index_(server_index), socket_(socket.Pass()) {}
 
 DnsSession::SocketLease::~SocketLease() {
   session_->FreeSocket(server_index_, socket_.Pass());
 }
@@ skipping 217 matching lines @@
   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