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

base/metrics/sample_vector_unittest.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 <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/bucket_ranges.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sample_vector.h"
@@ skipping 73 matching lines @@
   EXPECT_EQ(600, samples1.sum());
   EXPECT_EQ(300, samples1.TotalCount());
   EXPECT_EQ(samples1.redundant_count(), samples1.TotalCount());
 }
 
 #if (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)) && GTEST_HAS_DEATH_TEST
 TEST(SampleVectorDeathTest, BucketIndexTest) {
   // 8 buckets with exponential layout:
   // [0, 1) [1, 2) [2, 4) [4, 8) [8, 16) [16, 32) [32, 64) [64, INT_MAX)
   BucketRanges ranges(9);
-  Histogram::InitializeBucketRanges(1, 64, 8, &ranges);
+  Histogram::InitializeBucketRanges(1, 64, &ranges);
   SampleVector samples(&ranges);
 
   // Normal case
   samples.Accumulate(0, 1);
   samples.Accumulate(3, 2);
   samples.Accumulate(64, 3);
   EXPECT_EQ(1, samples.GetCount(0));
   EXPECT_EQ(2, samples.GetCount(2));
   EXPECT_EQ(3, samples.GetCount(65));
 
@@ skipping 151 matching lines @@
   samples.Accumulate(2, 100);
   it = samples.Iterator();
   EXPECT_FALSE(it->Done());
 }
 
 #endif
 // (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON)) && GTEST_HAS_DEATH_TEST
 
 }  // namespace
 }  // namespace base