Remove typically unused local_metadata_ field.

base/metrics/sample_vector.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.
 
 // SampleVector implements HistogramSamples interface. It is used by all
 // Histogram based classes to store samples.
 
 #ifndef BASE_METRICS_SAMPLE_VECTOR_H_
 #define BASE_METRICS_SAMPLE_VECTOR_H_
 
@@ skipping 11 matching lines @@
 #include "base/metrics/histogram_base.h"
 #include "base/metrics/histogram_samples.h"
 #include "base/metrics/persistent_memory_allocator.h"
 
 namespace base {
 
 class BucketRanges;
 
 class BASE_EXPORT SampleVectorBase : public HistogramSamples {
  public:
-  SampleVectorBase(uint64_t id, const BucketRanges* bucket_ranges);
   SampleVectorBase(uint64_t id,
                    Metadata* meta,
                    const BucketRanges* bucket_ranges);
   ~SampleVectorBase() override;
 
   // HistogramSamples:
   void Accumulate(HistogramBase::Sample value,
                   HistogramBase::Count count) override;
   HistogramBase::Count GetCount(HistogramBase::Sample value) const override;
   HistogramBase::Count TotalCount() const override;
@@ skipping 131 matching lines @@
   const HistogramBase::AtomicCount* counts_;
   size_t counts_size_;
   const BucketRanges* bucket_ranges_;
 
   size_t index_;
 };
 
 }  // namespace base
 
 #endif  // BASE_METRICS_SAMPLE_VECTOR_H_