SkRecord: infer return type for visit() and mutate().

src/gpu/GrRecordReplaceDraw.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrContext.h"
 #include "GrLayerCache.h"
 #include "GrRecordReplaceDraw.h"
@@ skipping 81 matching lines @@
             SkRect query = { 0, 0, 0, 0 };
             (void)fCanvas->getClipBounds(&query);
 
             bbh->search(query, &fOps);
 
             for (fIndex = 0; fIndex < fOps.count(); ++fIndex) {
                 if (fCallback && fCallback->abort()) {
                     return fNumReplaced;
                 }
 
-                record->visit<void>(fOps[fIndex], *this);
+                record->visit(fOps[fIndex], *this);
             }
 
         } else {
             for (fIndex = 0; fIndex < (int) record->count(); ++fIndex) {
                 if (fCallback && fCallback->abort()) {
                     return fNumReplaced;
                 }
 
-                record->visit<void>(fIndex, *this);
+                record->visit(fIndex, *this);
             }
         }
 
         return fNumReplaced;
     }
 
     // Same as Draw for all ops except DrawPicture and SaveLayer.
     template <typename T> void operator()(const T& r) {
         this->INHERITED::operator()(r);
     }
@@ skipping 95 matching lines @@
         ReplaceDraw draw(canvas, layerCache, nullptr, 0,
                          bp, bp,
                          initialMatrix, callback, nullptr, 0);
         return draw.draw();
     } else {
         // TODO: can we assume / assert this doesn't happen?
         picture->playback(canvas, callback);
         return 0;
     }
 }