Fix bug in SkGifCodec / Switch SkImageDec tests to use Codec

tests/InvalidIndexedPngTest.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
+#include "CodecPriv.h"
 #include "SkBitmap.h"
-#include "SkForceLinking.h"
-#include "SkImageDecoder.h"
 #include "Test.h"
 
 // A valid 1x1 indexed PNG.
 unsigned char gPngData[] = {
   0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d,
   0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01,
   0x08, 0x03, 0x00, 0x00, 0x00, 0x28, 0xcb, 0x34, 0xbb, 0x00, 0x00, 0x00,
   0x09, 0x70, 0x48, 0x59, 0x73, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x00, 0x00,
   0x1c, 0x00, 0x0f, 0x01, 0xb9, 0x8f, 0x00, 0x00, 0x00, 0x06, 0x50, 0x4c,
   0x54, 0x45, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0xd2, 0x87, 0xef, 0x71,
   0x00, 0x00, 0x00, 0x13, 0x49, 0x44, 0x41, 0x54, 0x78, 0xda, 0xed, 0xfd,
   0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0xf8, 0xaf, 0x16, 0x46, 0x00,
   0x02, 0x00, 0x01, 0x32, 0x60, 0xf7, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x49,
   0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82
 };
 
 // Attempt to decode an invalid PNG that has a palette. Mostly we're looking to
 // make sure we don't leak memory since libpng uses setjmp for error handling so
 // it's very easy to accidentally skip destructors when a failure happens.
 // As a result, we do not have any REPORTER_ASSERT statements
 DEF_TEST(InvalidIndexedPng, reporter) {
     SkBitmap image;
-    SkForceLinking(false);
     // Make our PNG invalid by changing a byte.
     gPngData[sizeof(gPngData) - 1] = 1;
 
-    SkImageDecoder::DecodeMemory(gPngData, sizeof(gPngData), &image);
+    decode_memory(gPngData, sizeof(gPngData), &image);
 }