remove dead SK_SUPPORT_LEGACY_IMAGEDECODER_CHOOSER code

src/images/SkImageDecoder_astc.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 "SkEndian.h"
 #include "SkColorPriv.h"
 #include "SkImageDecoder.h"
@@ skipping 99 matching lines @@
     const int depth = read_24bit(buf + 6);
 
     if (1 != depth) {
         // We don't support decoding 3D.
         return kFailure;
     }
 
     // Advance the buffer past the image dimensions
     buf += 9;
 
-#ifdef SK_SUPPORT_LEGACY_IMAGEDECODER_CHOOSER
-    // should we allow the Chooser (if present) to pick a config for us???
-    if (!this->chooseFromOneChoice(kN32_SkColorType, width, height)) {
-        return kFailure;
-    }
-#endif
-
     // Setup the sampler...
     SkScaledBitmapSampler sampler(width, height, this->getSampleSize());
 
     // Determine the alpha of the bitmap...
     SkAlphaType alphaType = kOpaque_SkAlphaType;
     if (this->getRequireUnpremultipliedColors()) {
         alphaType = kUnpremul_SkAlphaType;
     } else {
         alphaType = kPremul_SkAlphaType;
     }
@@ skipping 64 matching lines @@
 static SkImageDecoder_DecodeReg gReg(sk_libastc_dfactory);
 
 static SkImageDecoder::Format get_format_astc(SkStreamRewindable* stream) {
     if (is_astc(stream)) {
         return SkImageDecoder::kASTC_Format;
     }
     return SkImageDecoder::kUnknown_Format;
 }
 
 static SkImageDecoder_FormatReg gFormatReg(get_format_astc);