Refactoring: HashMap: provide a pointer match function, so users don't need to.

src/allocation-tracker.cc

Index: src/allocation-tracker.cc
diff --git a/src/allocation-tracker.cc b/src/allocation-tracker.cc
index a9103a84a37bd7d025248284f65862ca659a09db..ce530d144abf85422dbe60e04e0577e55e342fd6 100644
--- a/src/allocation-tracker.cc
+++ b/src/allocation-tracker.cc
@@ -211,11 +211,6 @@ void AddressToTraceMap::RemoveRange(Address start, Address end) {
 }
 
 
-static bool AddressesMatch(void* key1, void* key2) {
-  return key1 == key2;
-}
-
-
 void AllocationTracker::DeleteFunctionInfo(FunctionInfo** info) {
     delete *info;
 }
@@ -225,7 +220,7 @@ AllocationTracker::AllocationTracker(
     HeapObjectsMap* ids, StringsStorage* names)
     : ids_(ids),
       names_(names),
-      id_to_function_info_index_(AddressesMatch),
+      id_to_function_info_index_(HashMap::PointersMatch),
       info_index_for_other_state_(0) {
   FunctionInfo* info = new FunctionInfo();
   info->name = "(root)";