[deoptimizer] When deoptimizing code, unlink all functions referring to that code.

src/debug/liveedit.cc

Index: src/debug/liveedit.cc
diff --git a/src/debug/liveedit.cc b/src/debug/liveedit.cc
index fa70e77d1f828a92d77f56c550cd0b02a379e527..6dab0028c85140387f6e28103c15195d78daad99 100644
--- a/src/debug/liveedit.cc
+++ b/src/debug/liveedit.cc
@@ -839,8 +839,6 @@ class DependentFunctionMarker: public OptimizedFunctionVisitor {
   explicit DependentFunctionMarker(SharedFunctionInfo* shared_info)
     : shared_info_(shared_info), found_(false) { }
 
-  virtual void EnterContext(Context* context) { }  // Don't care.
-  virtual void LeaveContext(Context* context)  { }  // Don't care.
   virtual void VisitFunction(JSFunction* function) {
     // It should be guaranteed by the iterator that everything is optimized.
     DCHECK(function->code()->kind() == Code::OPTIMIZED_FUNCTION);