Fix lint errors and compile erors on Linux.

src/debug.h

Index: src/debug.h
===================================================================
--- src/debug.h	(revision 1269)
+++ src/debug.h	(working copy)
@@ -259,8 +259,8 @@
   static void HandleWeakDebugInfo(v8::Persistent<v8::Value> obj, void* data);
 
   friend class Debugger;
-  friend Handle<FixedArray> GetDebuggedFunctions();  // Found in test-debug.cc
-  friend void CheckDebuggerUnloaded(bool);  // Found in test-debug.cc
+  friend Handle<FixedArray> GetDebuggedFunctions();  // In test-debug.cc
+  friend void CheckDebuggerUnloaded(bool check_functions);  // In test-debug.cc
 
   // Threading support.
   static char* ArchiveDebug(char* to);