Delete reallyHasAlpha() from SkCodec

include/codec/SkAndroidCodec.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkAndroidCodec_DEFINED
 #define SkAndroidCodec_DEFINED
 
@@ skipping 208 matching lines @@
             const AndroidOptions* options);
 
     /**
      *  Simplified version of getAndroidPixels() where we supply the default AndroidOptions.
      *
      *  This will return an error if the info is kIndex_8_SkColorType and also will not perform
      *  any scaling or subsetting.
      */
     SkCodec::Result getAndroidPixels(const SkImageInfo& info, void* pixels, size_t rowBytes);
 
-    /**
-     *  Some images may initially report that they have alpha due to the format
-     *  of the encoded data, but then never use any colors which have alpha
-     *  less than 100%. This function can be called *after* decoding to
-     *  determine if such an image truly had alpha. Calling it before decoding
-     *  is undefined.
-     *  FIXME: see skbug.com/3582.
-     */
-    bool reallyHasAlpha() const {
-        return fCodec->reallyHasAlpha();
-    }
-
 protected:
 
     SkAndroidCodec(SkCodec*);
 
     SkCodec* codec() const { return fCodec.get(); }
 
     virtual SkISize onGetSampledDimensions(int sampleSize) const = 0;
 
     virtual bool onGetSupportedSubset(SkIRect* desiredSubset) const = 0;
 
     virtual SkCodec::Result onGetAndroidPixels(const SkImageInfo& info, void* pixels,
             size_t rowBytes, const AndroidOptions& options) = 0;
 
 private:
 
     // This will always be a reference to the info that is contained by the
     // embedded SkCodec.
     const SkImageInfo& fInfo;
 
     SkAutoTDelete<SkCodec> fCodec;
 };
 #endif // SkAndroidCodec_DEFINED