Revert "Add UMA Histogram Manager to Cronet."

components/metrics/histogram_encoder_unittest.cc

-// Copyright 2014 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 "components/metrics/histogram_encoder.h"
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/metrics/bucket_ranges.h"
-#include "base/metrics/sample_vector.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace metrics {
-
-TEST(HistogramEncoder, HistogramBucketFields) {
-  // Create buckets: 1-5, 5-7, 7-8, 8-9, 9-10, 10-11, 11-12.
-  base::BucketRanges ranges(8);
-  ranges.set_range(0, 1);
-  ranges.set_range(1, 5);
-  ranges.set_range(2, 7);
-  ranges.set_range(3, 8);
-  ranges.set_range(4, 9);
-  ranges.set_range(5, 10);
-  ranges.set_range(6, 11);
-  ranges.set_range(7, 12);
-
-  base::SampleVector samples(&ranges);
-  samples.Accumulate(3, 1);   // Bucket 1-5.
-  samples.Accumulate(6, 1);   // Bucket 5-7.
-  samples.Accumulate(8, 1);   // Bucket 8-9. (7-8 skipped)
-  samples.Accumulate(10, 1);  // Bucket 10-11. (9-10 skipped)
-  samples.Accumulate(11, 1);  // Bucket 11-12.
-
-  ChromeUserMetricsExtension uma_proto;
-  EncodeHistogramDelta("Test", samples, &uma_proto);
-
-  const HistogramEventProto& histogram_proto =
-      uma_proto.histogram_event(uma_proto.histogram_event_size() - 1);
-
-  // Buckets with samples: 1-5, 5-7, 8-9, 10-11, 11-12.
-  // Should become: 1-/, 5-7, /-9, 10-/, /-12.
-  ASSERT_EQ(5, histogram_proto.bucket_size());
-
-  // 1-5 becomes 1-/ (max is same as next min).
-  EXPECT_TRUE(histogram_proto.bucket(0).has_min());
-  EXPECT_FALSE(histogram_proto.bucket(0).has_max());
-  EXPECT_EQ(1, histogram_proto.bucket(0).min());
-
-  // 5-7 stays 5-7 (no optimization possible).
-  EXPECT_TRUE(histogram_proto.bucket(1).has_min());
-  EXPECT_TRUE(histogram_proto.bucket(1).has_max());
-  EXPECT_EQ(5, histogram_proto.bucket(1).min());
-  EXPECT_EQ(7, histogram_proto.bucket(1).max());
-
-  // 8-9 becomes /-9 (min is same as max - 1).
-  EXPECT_FALSE(histogram_proto.bucket(2).has_min());
-  EXPECT_TRUE(histogram_proto.bucket(2).has_max());
-  EXPECT_EQ(9, histogram_proto.bucket(2).max());
-
-  // 10-11 becomes 10-/ (both optimizations apply, omit max is prioritized).
-  EXPECT_TRUE(histogram_proto.bucket(3).has_min());
-  EXPECT_FALSE(histogram_proto.bucket(3).has_max());
-  EXPECT_EQ(10, histogram_proto.bucket(3).min());
-
-  // 11-12 becomes /-12 (last record must keep max, min is same as max - 1).
-  EXPECT_FALSE(histogram_proto.bucket(4).has_min());
-  EXPECT_TRUE(histogram_proto.bucket(4).has_max());
-  EXPECT_EQ(12, histogram_proto.bucket(4).max());
-}
-
-}  // namespace metrics