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 af054513176d92ecf2a507aa7e488e760c4d63d3..6be7d5bb881a893791f45c83e8ff552ffa69d452 100644
--- a/base/metrics/statistics_recorder_unittest.cc
+++ b/base/metrics/statistics_recorder_unittest.cc
@@ -32,7 +32,7 @@ class StatisticsRecorderTest : public testing::Test {
 
   void TearDown() override {
     UninitializeStatisticsRecorder();
-    PersistentHistogramAllocator::ReleaseGlobalAllocatorForTesting();
+    GlobalHistogramAllocator::ReleaseForTesting();
   }
 
   void InitializeStatisticsRecorder() {
@@ -326,8 +326,7 @@ 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);