base: Change auto to not deduce raw pointers.

base/trace_event/malloc_dump_provider.cc

Index: base/trace_event/malloc_dump_provider.cc
diff --git a/base/trace_event/malloc_dump_provider.cc b/base/trace_event/malloc_dump_provider.cc
index cf69859404e5a0b2694540d82e4f29461cdaea0f..3b1a933bce56f8154f7871434f8cf692b02b3267 100644
--- a/base/trace_event/malloc_dump_provider.cc
+++ b/base/trace_event/malloc_dump_provider.cc
@@ -229,7 +229,7 @@ void MallocDumpProvider::InsertAllocation(void* address, size_t size) {
   // This is the case of GetInstanceForCurrentThread() being called for the
   // first time, which causes a new() inside the tracker which re-enters the
   // heap profiler, in which case we just want to early out.
-  auto tracker = AllocationContextTracker::GetInstanceForCurrentThread();
+  auto* tracker = AllocationContextTracker::GetInstanceForCurrentThread();
   if (!tracker)
     return;
   AllocationContext context = tracker->GetContextSnapshot();