Remove image decoder and encoder autoregistration

tests/GifTest.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.
  */
 
 // This tests out GIF decoder (SkImageDecoder_libgif.cpp)
 // It is not used on these platforms:
 #if (!defined(SK_BUILD_FOR_WIN32)) &&           \
     (!defined(SK_BUILD_FOR_IOS)) &&             \
     (!defined(SK_BUILD_FOR_MAC))
 
 #include "SkBitmap.h"
 #include "SkData.h"
-#include "SkForceLinking.h"
 #include "SkImage.h"
 #include "SkImageDecoder.h"
 #include "SkStream.h"
 #include "Test.h"
 
-__SK_FORCE_IMAGE_DECODER_LINKING;
-
 static unsigned char gGIFData[] = {
   0x47, 0x49, 0x46, 0x38, 0x37, 0x61, 0x03, 0x00, 0x03, 0x00, 0xe3, 0x08,
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0x00,
   0xff, 0x80, 0x80, 0x80, 0x00, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
   0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
   0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
   0xff, 0x2c, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x03, 0x00, 0x00, 0x04,
   0x07, 0x50, 0x1c, 0x43, 0x40, 0x41, 0x23, 0x44, 0x00, 0x3b
 };
 
@@ skipping 157 matching lines @@
     // test short Gif.  80 is missing a few bytes.
     test_gif_data_short(reporter, static_cast<void *>(gGIFData), 80);
     // "libgif warning [DGifGetLine]"
 
     test_interlaced_gif_data(reporter, static_cast<void *>(gInterlacedGIF),
                              100);  // 100 is missing a few bytes
     // "libgif warning [interlace DGifGetLine]"
 }
 
 #endif  // !(SK_BUILD_FOR_WIN32||SK_BUILD_FOR_IOS||SK_BUILD_FOR_MAC)