Don't ref/unref the static src-over xp

src/gpu/gl/GrGLProgramDesc.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "GrGLProgramDesc.h"
 
 #include "GrProcessor.h"
 #include "GrGLGpu.h"
@@ skipping 107 matching lines @@
     }
 
     for (int i = 0; i < pipeline.numFragmentProcessors(); ++i) {
         const GrFragmentProcessor& fp = pipeline.getFragmentProcessor(i);
         if (!gen_frag_proc_and_meta_keys(primProc, fp, gpu->glCaps(), &b)) {
             glDesc->key().reset();
             return false;
         }
     }
 
-    const GrXferProcessor& xp = *pipeline.getXferProcessor();
+    const GrXferProcessor& xp = pipeline.getXferProcessor();
     xp.getGLSLProcessorKey(*gpu->glCaps().glslCaps(), &b);
     //**** use glslCaps here?
     if (!gen_meta_key(xp, gpu->glCaps(), 0, &b)) {
         glDesc->key().reset();
         return false;
     }
 
     // --------DO NOT MOVE HEADER ABOVE THIS LINE--------------------------------------------------
     // Because header is a pointer into the dynamic array, we can't push any new data into the key
     // below here.
@@ skipping 14 matching lines @@
     } else {
         header->fIgnoresCoverage = 0;
     }
 
     header->fSnapVerticesToPixelCenters = pipeline.snapVerticesToPixelCenters();
     header->fColorEffectCnt = pipeline.numColorFragmentProcessors();
     header->fCoverageEffectCnt = pipeline.numCoverageFragmentProcessors();
     glDesc->finalize();
     return true;
 }