Revert "Support for precise stepping in functions compiled before debugging was started (step 2)"

src/debug.h

Index: src/debug.h
diff --git a/src/debug.h b/src/debug.h
index b77b48d71f5d1f266995b27e45dc50cb576fcae0..a098040c0dfefd5c5ebc84660f39f0638cb1de65 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -809,15 +809,11 @@ class Debugger {
   }
 
   void set_compiling_natives(bool compiling_natives) {
-    compiling_natives_ = compiling_natives;
+    Debugger::compiling_natives_ = compiling_natives;
   }
   bool compiling_natives() const { return compiling_natives_; }
   void set_loading_debugger(bool v) { is_loading_debugger_ = v; }
   bool is_loading_debugger() const { return is_loading_debugger_; }
-  void set_force_debugger_active(bool force_debugger_active) {
-    force_debugger_active_ = force_debugger_active;
-  }
-  bool force_debugger_active() const { return force_debugger_active_; }
 
   bool IsDebuggerActive();
 
@@ -843,7 +839,6 @@ class Debugger {
   bool compiling_natives_;  // Are we compiling natives?
   bool is_loading_debugger_;  // Are we loading the debugger?
   bool never_unload_debugger_;  // Can we unload the debugger?
-  bool force_debugger_active_;  // Activate debugger without event listeners.
   v8::Debug::MessageHandler2 message_handler_;
   bool debugger_unload_pending_;  // Was message handler cleared?
   v8::Debug::HostDispatchHandler host_dispatch_handler_;