[Experimental, DO NOT LAND] bucket num 4

base/trace_event/heap_profiler_allocation_register.h

Index: base/trace_event/heap_profiler_allocation_register.h
diff --git a/base/trace_event/heap_profiler_allocation_register.h b/base/trace_event/heap_profiler_allocation_register.h
index d6a02faeaeaacca487e3ff13d7f71dac34768da1..35967e5b70e6e7af1867033408394033c044fcb5 100644
--- a/base/trace_event/heap_profiler_allocation_register.h
+++ b/base/trace_event/heap_profiler_allocation_register.h
@@ -13,6 +13,7 @@
 #include "base/bits.h"
 #include "base/logging.h"
 #include "base/macros.h"
+#include "base/memory/address_hasher.h"
 #include "base/process/process_metrics.h"
 #include "base/template_util.h"
 #include "base/trace_event/heap_profiler_allocation_context.h"
@@ -341,10 +342,6 @@ class BASE_EXPORT AllocationRegister {
     BacktraceMap::KVIndex backtrace_index;
   };
 
-  struct AddressHasher {
-    size_t operator () (const void* address) const;
-  };
-
   using AllocationMap = internal::FixedHashMap<
       kAllocationBuckets,
       const void*,