Histogram type support in HistogramBase and remove SetRangeDescription function

chrome/browser/extensions/api/metrics/metrics.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 CHROME_BROWSER_EXTENSIONS_API_METRICS_METRICS_H_
 #define CHROME_BROWSER_EXTENSIONS_API_METRICS_METRICS_H_
 
 #include <string>
 
 #include "base/metrics/histogram.h"
@@ skipping 10 matching lines @@
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
 };
 
 class MetricsHistogramHelperFunction : public SyncExtensionFunction {
  protected:
   virtual ~MetricsHistogramHelperFunction() {}
   bool GetNameAndSample(std::string* name, int* sample);
   virtual bool RecordValue(const std::string& name,
-                           base::Histogram::ClassType type,
+                           base::HistogramType type,
                            int min, int max, size_t buckets,
                            int sample);
 };
 
 class MetricsRecordValueFunction : public MetricsHistogramHelperFunction {
  public:
   DECLARE_EXTENSION_FUNCTION_NAME("metricsPrivate.recordValue")
 
  protected:
   virtual ~MetricsRecordValueFunction() {}
@@ skipping 75 matching lines @@
  protected:
   virtual ~MetricsRecordLongTimeFunction() {}
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
 };
 
 } // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_METRICS_METRICS_H_