Drop broken and unnecessary RequiredInputRepresentation() in HMathFloorOfDiv.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/23190002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16190 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-instructions.h

@@ -3841,10 +3841,6 @@ class HMathFloorOfDiv: public HBinaryOperation {
 
   virtual HValue* EnsureAndPropagateNotMinusZero(BitVector* visited);
 
-  virtual Representation RequiredInputRepresentation(int index) {
-    return Representation::Integer32();
-  }
-
   DECLARE_CONCRETE_INSTRUCTION(MathFloorOfDiv)
 
  protected: