[base] Remove PointersMatch, making a separate std::equals hashmap

src/ast/ast-value-factory.h

Index: src/ast/ast-value-factory.h
diff --git a/src/ast/ast-value-factory.h b/src/ast/ast-value-factory.h
index efa72ab0c2a978d692bb69e4d3b25990b8ae7558..bc3eca264e0476c58a96479a6231235a3ef96353 100644
--- a/src/ast/ast-value-factory.h
+++ b/src/ast/ast-value-factory.h
@@ -403,7 +403,7 @@ class AstValueFactory {
   static bool AstRawStringCompare(void* a, void* b);
 
   // All strings are copied here, one after another (no NULLs inbetween).
-  base::HashMap string_table_;
+  base::CustomMatcherHashMap string_table_;
   // For keeping track of all AstValues and AstRawStrings we've created (so that
   // they can be internalized later).
   AstValue* values_;