Revert of Scanline decoding for gifs

tests/CodexTest.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 "Resources.h"
 #include "SkBitmap.h"
 #include "SkCodec.h"
@@ skipping 203 matching lines @@
     check(r, "randPixels.bmp", SkISize::Make(8, 8), true, false);
 
     // ICO
     // These two tests examine interestingly different behavior:
     // Decodes an embedded BMP image
     check(r, "color_wheel.ico", SkISize::Make(128, 128), false, false);
     // Decodes an embedded PNG image
     check(r, "google_chrome.ico", SkISize::Make(256, 256), false, false);
 
     // GIF
-    check(r, "box.gif", SkISize::Make(200, 55), true, false);
-    check(r, "color_wheel.gif", SkISize::Make(128, 128), true, false);
-    check(r, "randPixels.gif", SkISize::Make(8, 8), true, false);
+    check(r, "box.gif", SkISize::Make(200, 55), false, false);
+    check(r, "color_wheel.gif", SkISize::Make(128, 128), false, false);
+    check(r, "randPixels.gif", SkISize::Make(8, 8), false, false);
 
     // JPG
     check(r, "CMYK.jpg", SkISize::Make(642, 516), true, false, false);
     check(r, "color_wheel.jpg", SkISize::Make(128, 128), true, false);
     check(r, "grayscale.jpg", SkISize::Make(128, 128), true, false);
     check(r, "mandrill_512_q075.jpg", SkISize::Make(512, 512), true, false);
     check(r, "randPixels.jpg", SkISize::Make(8, 8), true, false);
 
     // PNG
     check(r, "arrow.png", SkISize::Make(187, 312), true, false);
@@ skipping 150 matching lines @@
     REPORTER_ASSERT(r, SkCodec::kInvalidParameters == result);
     result = decoder->start(
         decoder->getInfo().makeColorType(kIndex_8_SkColorType));
     REPORTER_ASSERT(r, SkCodec::kInvalidParameters == result);
 }
 
 DEF_TEST(Codec_Params, r) {
     test_invalid_parameters(r, "index8.png");
     test_invalid_parameters(r, "mandrill.wbmp");
 }