Write non-critical log messages only for -v=1.

base/metrics/persistent_histogram_allocator.cc

 // Copyright 2016 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 "base/metrics/persistent_histogram_allocator.h"
 
 #include <memory>
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ skipping 642 matching lines @@
 // static
 void GlobalHistogramAllocator::Set(
     std::unique_ptr<GlobalHistogramAllocator> allocator) {
   // Releasing or changing an allocator is extremely dangerous because it
   // likely has histograms stored within it. If the backing memory is also
   // also released, future accesses to those histograms will seg-fault.
   CHECK(!g_allocator);
   g_allocator = allocator.release();
   size_t existing = StatisticsRecorder::GetHistogramCount();
 
-  DLOG_IF(WARNING, existing)
+  DVLOG_IF(1, existing)
       << existing << " histograms were created before persistence was enabled.";
 }
 
 // static
 GlobalHistogramAllocator* GlobalHistogramAllocator::Get() {
   return g_allocator;
 }
 
 // static
 std::unique_ptr<GlobalHistogramAllocator>
@@ skipping 50 matching lines @@
   while (true) {
     std::unique_ptr<HistogramBase> histogram =
         import_iterator_.GetNextWithIgnore(record_to_ignore);
     if (!histogram)
       break;
     StatisticsRecorder::RegisterOrDeleteDuplicate(histogram.release());
   }
 }
 
 }  // namespace base