base: Remove auto raw pointer deduction.

base/test/histogram_tester.cc

Index: base/test/histogram_tester.cc
diff --git a/base/test/histogram_tester.cc b/base/test/histogram_tester.cc
index 59ea1c630217a3e9cdc3d986b8594bc5201db63b..5ca3c2fe9e8dd6145f05741fdf6022be49e877e0 100644
--- a/base/test/histogram_tester.cc
+++ b/base/test/histogram_tester.cc
@@ -23,7 +23,7 @@ HistogramTester::HistogramTester() {
   // be subtracted later.
   StatisticsRecorder::Histograms histograms;
   StatisticsRecorder::GetSnapshot(std::string(), &histograms);
-  for (const auto& histogram : histograms) {
+  for (const auto* histogram : histograms) {
     histograms_snapshot_[histogram->histogram_name()] =
         histogram->SnapshotSamples();
   }