[debugger] Remove code to predict step-in target.

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index c1ab8134667576f87cf1e77f7b3540451b36a237..928284d03a02bd7aef0bf136987b420bca555f01 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -1580,9 +1580,9 @@ ExternalReference ExternalReference::mod_two_doubles_operation(
 }
 
 
-ExternalReference ExternalReference::debug_last_step_action_address(
+ExternalReference ExternalReference::debug_step_in_enabled_address(
     Isolate* isolate) {
-  return ExternalReference(isolate->debug()->last_step_action_addr());
+  return ExternalReference(isolate->debug()->step_in_enabled_address());
 }