Remove willReadDst from GrFragmentProcessor.

include/gpu/GrXferProcessor.h

Index: include/gpu/GrXferProcessor.h
diff --git a/include/gpu/GrXferProcessor.h b/include/gpu/GrXferProcessor.h
index 2c9961fc6b625cc231fd001aa1f9270f00910e69..13e4d2633ff30045b816db20b999744953a20ee7 100644
--- a/include/gpu/GrXferProcessor.h
+++ b/include/gpu/GrXferProcessor.h
@@ -205,10 +205,7 @@ public:
     /**
      *  Returns true if the XP generated by this factory will read dst.
      */
-    // TODO: Currently this function must also check if the color/coverage stages read dst.
-    //       Once only XP's can read dst we can remove the ProcOptInfo's from this function.
-    virtual bool willReadDst(const GrProcOptInfo& colorPOI,
-                             const GrProcOptInfo& coveragePOI) const = 0;
+    virtual bool willReadDst() const = 0;
 
     bool isEqual(const GrXPFactory& that) const {
         if (this->classID() != that.classID()) {