This return_false is now only used on Android. Squelch a warning.

src/images/SkImageDecoder_libjpeg.cpp

 /*
  * Copyright 2007 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.
  */
 
 
 #include "SkImageDecoder.h"
 #include "SkImageEncoder.h"
@@ skipping 327 matching lines @@
                  cinfo.err->msg_code, buffer, caller, width, height);
     }
 }
 
 static bool return_false(const jpeg_decompress_struct& cinfo,
                          const char caller[]) {
     print_jpeg_decoder_errors(cinfo, 0, 0, caller);
     return false;
 }
 
+#ifdef SK_BUILD_FOR_ANDROID
 static bool return_false(const jpeg_decompress_struct& cinfo,
                          const SkBitmap& bm, const char caller[]) {
     print_jpeg_decoder_errors(cinfo, bm.width(), bm.height(), caller);
     return false;
 }
+#endif
 
 static SkImageDecoder::Result return_failure(const jpeg_decompress_struct& cinfo,
                                              const SkBitmap& bm, const char caller[]) {
     print_jpeg_decoder_errors(cinfo, bm.width(), bm.height(), caller);
     return SkImageDecoder::kFailure;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 // Convert a scanline of CMYK samples to RGBX in place. Note that this
@@ skipping 1082 matching lines @@
     return SkImageDecoder::kUnknown_Format;
 }
 
 static SkImageEncoder* sk_libjpeg_efactory(SkImageEncoder::Type t) {
     return (SkImageEncoder::kJPEG_Type == t) ? SkNEW(SkJPEGImageEncoder) : NULL;
 }
 
 static SkImageDecoder_DecodeReg gDReg(sk_libjpeg_dfactory);
 static SkImageDecoder_FormatReg gFormatReg(get_format_jpeg);
 static SkImageEncoder_EncodeReg gEReg(sk_libjpeg_efactory);