Cleanup histograms from message loop, as well as kHexRangePrintingFlag.

base/metrics/sparse_histogram.cc

 // 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.
 
 #include "base/metrics/sparse_histogram.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/metrics/metrics_hashes.h"
@@ skipping 264 matching lines @@
     it->Next();
   }
 }
 
 void SparseHistogram::WriteAsciiHeader(const Count total_count,
                                        std::string* output) const {
   StringAppendF(output,
                 "Histogram: %s recorded %d samples",
                 histogram_name().c_str(),
                 total_count);
-  if (flags() & ~kHexRangePrintingFlag)
-    StringAppendF(output, " (flags = 0x%x)", flags() & ~kHexRangePrintingFlag);
+  if (flags())
+    StringAppendF(output, " (flags = 0x%x)", flags());
 }
 
 }  // namespace base