Fix overflow bug in histogram sample data structures

base/metrics/histogram.h

Index: base/metrics/histogram.h
diff --git a/base/metrics/histogram.h b/base/metrics/histogram.h
index 28bb29b6e3dbae6c2e32a37d516c52ad78c3c8df..93f704a5d91d39c1b36f64a86a7a29495ceefaf9 100644
--- a/base/metrics/histogram.h
+++ b/base/metrics/histogram.h
@@ -220,10 +220,7 @@ class BASE_EXPORT Histogram : public HistogramBase {
   // Allow tests to corrupt our innards for testing purposes.
   FRIEND_TEST_ALL_PREFIXES(HistogramTest, BoundsTest);
   FRIEND_TEST_ALL_PREFIXES(HistogramTest, BucketPlacementTest);
-  FRIEND_TEST_ALL_PREFIXES(HistogramTest, CorruptBucketBounds);
   FRIEND_TEST_ALL_PREFIXES(HistogramTest, CorruptSampleCounts);
-  FRIEND_TEST_ALL_PREFIXES(HistogramTest, NameMatchTest);
-  FRIEND_TEST_ALL_PREFIXES(HistogramTest, AddCountTest);
 
   friend class StatisticsRecorder;  // To allow it to delete duplicates.
   friend class StatisticsRecorderTest;