Remove duplicate function

BUG=none
TEST=none
Review URL: https://webrtc-codereview.appspot.com/1311006

git-svn-id: http://libyuv.googlecode.com/svn/trunk@657 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 656
+Version: 657
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 656
+#define LIBYUV_VERSION 657
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

source/mjpeg_decoder.cc

@@ -75,30 +75,6 @@ MJpegDecoder::~MJpegDecoder() {
   DestroyOutputBuffers();
 }
 
-// Helper function to validate the jpeg looks ok.
-// TODO(fbarchard): Optimize case where SOI is found but EOI is not.
-bool ValidateJpeg(const uint8* sample, size_t sample_size) {
-  if (sample_size < 64) {
-    // ERROR: Invalid jpeg size: sample_size
-    return false;
-  }
-  if (sample[0] != 0xff || sample[1] != 0xd8) {  // Start Of Image
-    // ERROR: Invalid jpeg initial start code
-    return false;
-  }
-  for (int i = static_cast<int>(sample_size) - 2; i > 1;) {
-    if (sample[i] != 0xd9) {
-      if (sample[i] == 0xff && sample[i + 1] == 0xd9) {  // End Of Image
-        return true;
-      }
-      --i;
-    }
-    --i;
-  }
-  // ERROR: Invalid jpeg end code not found. Size sample_size
-  return false;
-}
-
 bool MJpegDecoder::LoadFrame(const uint8* src, size_t src_len) {
   if (!ValidateJpeg(src, src_len)) {
     return false;