Fix crash in debug builds introduced with r21110.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index 6d460c67f70667514bd256c0550a7ff667ad9805..3154fe5f794b4904bb073b473e840664402e8a55 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -2130,7 +2130,6 @@ class LStoreNamedField V8_FINAL : public LTemplateInstruction<0, 2, 1> {
 
   virtual void PrintDataTo(StringStream* stream) V8_OVERRIDE;
 
-  Handle<Map> transition() const { return hydrogen()->transition_map(); }
   Representation representation() const {
     return hydrogen()->field_representation();
   }
@@ -2710,9 +2709,6 @@ class LChunkBuilder V8_FINAL : public LChunkBuilderBase {
 
   void Abort(BailoutReason reason);
 
-  // Methods for code dependencies.
-  void AddDeprecationDependency(Handle<Map> map);
-
   // Methods for getting operands for Use / Define / Temp.
   LUnallocated* ToUnallocated(Register reg);
   LUnallocated* ToUnallocated(XMMRegister reg);