ash: Change auto to not deduce raw pointers.

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index 1aef496770daa67a4e0154835a25e41aaa87ef56..9a7e55d17f83965b9d1faef4d880648d66de3ecd 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -184,7 +184,7 @@ void ShowDeprecatedAcceleratorNotification(const char* const notification_id,
 
 void RecordUmaHistogram(const char* histogram_name,
                         DeprecatedAcceleratorUsage sample) {
-  auto histogram = base::LinearHistogram::FactoryGet(
+  auto* histogram = base::LinearHistogram::FactoryGet(
       histogram_name, 1, DEPRECATED_USAGE_COUNT, DEPRECATED_USAGE_COUNT + 1,
       base::HistogramBase::kUmaTargetedHistogramFlag);
   histogram->Add(sample);