Break global impact of PersistentHistogramAllocator into a separate class.

base/metrics/statistics_recorder_unittest.cc

Index: base/metrics/statistics_recorder_unittest.cc
diff --git a/base/metrics/statistics_recorder_unittest.cc b/base/metrics/statistics_recorder_unittest.cc
index 073cbb1616458913b3c930cf7b5082b84025749a..c98ce9c4d79e45d9d92d9f4d5db94eeca301754b 100644
--- a/base/metrics/statistics_recorder_unittest.cc
+++ b/base/metrics/statistics_recorder_unittest.cc
@@ -31,7 +31,7 @@ class StatisticsRecorderTest : public testing::Test {
 
   void TearDown() override {
     UninitializeStatisticsRecorder();
-    PersistentHistogramAllocator::ReleaseGlobalAllocatorForTesting();
+    GlobalHistogramAllocator::ReleaseForTesting();
   }
 
   void InitializeStatisticsRecorder() {
@@ -325,8 +325,7 @@ TEST_F(StatisticsRecorderTest, ToJSON) {
 TEST_F(StatisticsRecorderTest, IterationTest) {
   StatisticsRecorder::Histograms registered_histograms;
   LOCAL_HISTOGRAM_COUNTS("TestHistogram.IterationTest1", 30);
-  PersistentHistogramAllocator::CreateGlobalAllocatorOnLocalMemory(
-      64 << 10 /* 64 KiB */, 0, "");
+  GlobalHistogramAllocator::CreateWithLocalMemory(64 << 10 /* 64 KiB */, 0, "");
   LOCAL_HISTOGRAM_COUNTS("TestHistogram.IterationTest2", 30);
 
   StatisticsRecorder::HistogramIterator i1 = StatisticsRecorder::begin(true);