Cleanup histograms from message loop, as well as kHexRangePrintingFlag.

base/metrics/histogram.cc

Index: base/metrics/histogram.cc
diff --git a/base/metrics/histogram.cc b/base/metrics/histogram.cc
index ab6cdd0f2d6ba3d09f7cc646878aff389a2ed4da..a75abd649b23b1d52e9c290eb1fa632c58f633d9 100644
--- a/base/metrics/histogram.cc
+++ b/base/metrics/histogram.cc
@@ -673,15 +673,14 @@ void Histogram::WriteAsciiHeader(const SampleVector& samples,
                 "Histogram: %s recorded %d samples",
                 histogram_name().c_str(),
                 sample_count);
-  if (0 == sample_count) {
+  if (sample_count == 0) {
     DCHECK_EQ(samples.sum(), 0);
   } else {
-    double average = static_cast<float>(samples.sum()) / sample_count;
-
-    StringAppendF(output, ", average = %.1f", average);
+    double mean = static_cast<float>(samples.sum()) / sample_count;
+    StringAppendF(output, ", mean = %.1f", mean);
   }
-  if (flags() & ~kHexRangePrintingFlag)
-    StringAppendF(output, " (flags = 0x%x)", flags() & ~kHexRangePrintingFlag);
+  if (flags())
+    StringAppendF(output, " (flags = 0x%x)", flags());
 }
 
 void Histogram::WriteAsciiBucketContext(const int64_t past,