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

base/metrics/histogram_base.h

 // 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.
 
 #ifndef BASE_METRICS_HISTOGRAM_BASE_H_
 #define BASE_METRICS_HISTOGRAM_BASE_H_
 
 #include <string>
 
 #include "base/base_export.h"
@@ skipping 76 matching lines @@
   std::string histogram_name() const { return histogram_name_; }
 
   // Operations with Flags enum.
   int32 flags() const { return flags_; }
   void SetFlags(int32 flags);
   void ClearFlags(int32 flags);
 
   virtual HistogramType GetHistogramType() const = 0;
 
   // Whether the histogram has construction arguments as parameters specified.
-  // For histograms that don't have the concept of |minimum|, |maximum| or
-  // |bucket_count|, this function always returns false.
-  virtual bool HasConstructionArguments(Sample minimum,
-                                        Sample maximum,
-                                        size_t bucket_count) const = 0;
+  // For histograms that don't have the concept of minimum, maximum or
+  // bucket_count, this function always returns false.
+  virtual bool HasConstructionArguments(Sample expected_minimum,
+                                        Sample expected_maximum,
+                                        size_t expected_bucket_count) const = 0;
 
   virtual void Add(Sample value) = 0;
 
   // 2 convenient functions that call Add(Sample).
   void AddTime(const TimeDelta& time);
   void AddBoolean(bool value);
 
   virtual void AddSamples(const HistogramSamples& samples) = 0;
   virtual bool AddSamplesFromPickle(PickleIterator* iter) = 0;
 
@@ skipping 50 matching lines @@
  private:
   const std::string histogram_name_;
   int32 flags_;
 
   DISALLOW_COPY_AND_ASSIGN(HistogramBase);
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_HISTOGRAM_BASE_H_