Revert of Create xfer processor backend.

src/gpu/gl/GrGLProcessor.h

Index: src/gpu/gl/GrGLProcessor.h
diff --git a/src/gpu/gl/GrGLProcessor.h b/src/gpu/gl/GrGLProcessor.h
index a4fad753ec668ae276f6c0e725f3d41b83d4c9b9..6dccd33bac40764f5adba2b7762ccdabd3a53e0a 100644
--- a/src/gpu/gl/GrGLProcessor.h
+++ b/src/gpu/gl/GrGLProcessor.h
@@ -117,4 +117,14 @@
     typedef GrGLProcessor INHERITED;
 };
 
+class GrGLXferProcessor : public GrGLFragmentProcessor {
+public:
+    GrGLXferProcessor() {}
+    
+    virtual ~GrGLXferProcessor() {}
+
+private:
+    typedef GrGLFragmentProcessor INHERITED;
+};
+
 #endif