Remove image decoder and encoder autoregistration

tools/skpdiff/skpdiff_main.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.
  */
 
 // TODO(djsollen): Rename this whole package (perhaps to "SkMultiDiffer").
 // It's not just for "pdiff" (perceptual diffs)--it's a harness that allows
 // the execution of an arbitrary set of difference algorithms.
@@ skipping 17 matching lines @@
 #include "SkStream.h"
 #include "SkTDArray.h"
 #include "SkTaskGroup.h"
 
 #include "SkDifferentPixelsMetric.h"
 #include "SkDiffContext.h"
 #include "SkImageDiffer.h"
 #include "SkPMetric.h"
 #include "skpdiff_util.h"
 
-#include "SkForceLinking.h"
-__SK_FORCE_IMAGE_DECODER_LINKING;
-
 // Command line argument definitions go here
 DEFINE_bool2(list, l, false, "List out available differs");
 DEFINE_string2(differs, d, "", "The names of the differs to use or all of them by default");
 DEFINE_string2(folders, f, "", "Compare two folders with identical subfile names: <baseline folder> <test folder>");
 DEFINE_string2(patterns, p, "", "Use two patterns to compare images: <baseline> <test>");
 DEFINE_string2(output, o, "", "Writes a JSON summary of these diffs to file: <filepath>");
 DEFINE_string(alphaDir, "", "If the differ can generate an alpha mask, write it into directory: <dirpath>");
 DEFINE_string(rgbDiffDir, "", "If the differ can generate an image showing the RGB diff at each pixel, write it into directory: <dirpath>");
 DEFINE_string(whiteDiffDir, "", "If the differ can generate an image showing every changed pixel in white, write it into directory: <dirpath>");
 DEFINE_bool(jsonp, true, "Output JSON with padding");
@@ skipping 206 matching lines @@
     }
 
     return 0;
 }
 
 #if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
 int main(int argc, char * argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif