Delete reallyHasAlpha() from SkCodec

src/codec/SkCodecPriv.h

 /*
  * Copyright 2015 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCodecPriv_DEFINED
 #define SkCodecPriv_DEFINED
 
 #include "SkColorPriv.h"
 #include "SkColorTable.h"
 #include "SkImageInfo.h"
-#include "SkSwizzler.h"
 #include "SkTypes.h"
 #include "SkUtils.h"
 
-/*
- *
- * Helper routine for alpha result codes
- *
- */
-#define INIT_RESULT_ALPHA                       \
-    uint8_t zeroAlpha = 0;                      \
-    uint8_t maxAlpha = 0xFF;
-
-#define UPDATE_RESULT_ALPHA(alpha)              \
-    zeroAlpha |= (alpha);                       \
-    maxAlpha  &= (alpha);
-
-#define COMPUTE_RESULT_ALPHA                    \
-    SkSwizzler::GetResult(zeroAlpha, maxAlpha);
-
 // FIXME: Consider sharing with dm, nanbench, and tools.
 inline float get_scale_from_sample_size(int sampleSize) {
     return 1.0f / ((float) sampleSize);
 }
 
 inline bool is_valid_subset(const SkIRect& subset, const SkISize& imageDims) {
     return SkIRect::MakeSize(imageDims).contains(subset);
 }
 
 /*
@@ skipping 203 matching lines @@
 #endif
 }
 
 #ifdef SK_PRINT_CODEC_MESSAGES
     #define SkCodecPrintf SkDebugf
 #else
     #define SkCodecPrintf(...)
 #endif
 
 #endif // SkCodecPriv_DEFINED