[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/base/metrics/sample_vector_unittest.cc b/base/metrics/sample_vector_unittest.cc
index dbbbd15..9c7ba96 100644
--- a/base/metrics/sample_vector_unittest.cc
+++ b/base/metrics/sample_vector_unittest.cc
@@ -91,7 +91,7 @@
   // 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