base: Change auto to not deduce raw pointers.

base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc

Index: base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc
diff --git a/base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc b/base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc
index 07d5f253dd46ed77ea4a332101f5779b02407c9f..3064a6a711792e68c41976ce541c591dd586d588 100644
--- a/base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc
+++ b/base/trace_event/heap_profiler_allocation_context_tracker_unittest.cc
@@ -34,8 +34,8 @@ void AssertBacktraceEquals(const StackFrame(&expected_backtrace)[N]) {
       AllocationContextTracker::GetInstanceForCurrentThread()
           ->GetContextSnapshot();
 
-  auto actual = std::begin(ctx.backtrace.frames);
-  auto actual_bottom = actual + ctx.backtrace.frame_count;
+  auto* actual = std::begin(ctx.backtrace.frames);
+  auto* actual_bottom = actual + ctx.backtrace.frame_count;
   auto expected = std::begin(expected_backtrace);
   auto expected_bottom = std::end(expected_backtrace);