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

BUG=248623
TEST=none
[email protected]

Review URL: https://chromiumcodereview.appspot.com/17451016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@208917 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/net/dns/dns_session.cc b/net/dns/dns_session.cc
index 3577212..592ca30 100644
--- a/net/dns/dns_session.cc
+++ b/net/dns/dns_session.cc
@@ -64,7 +64,7 @@
     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,