Removed useless Canonicalize implementations subsumed by dead code elimination.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 4ad98b83c2751a3ff2322e8df1f1a28caad18b59..d11835452c72d7024f2a38bb49a854eba7ce45f1 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -2610,7 +2610,6 @@ class HConstant: public HTemplateInstruction<0> {
   }
 
   virtual bool EmitAtUses() { return !representation().IsDouble(); }
-  virtual HValue* Canonicalize();
   virtual void PrintDataTo(StringStream* stream);
   virtual HType CalculateInferredType();
   bool IsInteger() { return handle()->IsSmi(); }
@@ -5034,7 +5033,6 @@ class HTypeof: public HTemplateInstruction<2> {
   HValue* context() { return OperandAt(0); }
   HValue* value() { return OperandAt(1); }
 
-  virtual HValue* Canonicalize();
   virtual void PrintDataTo(StringStream* stream);
 
   virtual Representation RequiredInputRepresentation(int index) {