Revert r6180 as it caused test failures

src/debug.h

Index: src/debug.h
===================================================================
--- src/debug.h	(revision 6182)
+++ src/debug.h	(working copy)
@@ -32,7 +32,6 @@
 #include "debug-agent.h"
 #include "execution.h"
 #include "factory.h"
-#include "flags.h"
 #include "hashmap.h"
 #include "platform.h"
 #include "string-stream.h"
@@ -773,15 +772,6 @@
       }
     }
 
-    if (((event == v8::BeforeCompile) || (event == v8::AfterCompile)) &&
-        !FLAG_debug_compile_events) {
-      return false;
-
-    } else if ((event == v8::ScriptCollected) &&
-               !FLAG_debug_script_collected_events) {
-      return false;
-    }
-
     // Currently argument event is not used.
     return !compiling_natives_ && Debugger::IsDebuggerActive();
   }