Drop DecryptConfig::data_offset_.

media/base/decrypt_config.cc

Index: media/base/decrypt_config.cc
diff --git a/media/base/decrypt_config.cc b/media/base/decrypt_config.cc
index 53e20143e1b0a0bdbbc82409d2a97f8fa64263f3..a47806504a77f85e4b8387aa7d4e3b8eaadf7176 100644
--- a/media/base/decrypt_config.cc
+++ b/media/base/decrypt_config.cc
@@ -10,16 +10,13 @@ namespace media {
 
 DecryptConfig::DecryptConfig(const std::string& key_id,
                              const std::string& iv,
-                             const int data_offset,
                              const std::vector<SubsampleEntry>& subsamples)
     : key_id_(key_id),
       iv_(iv),
-      data_offset_(data_offset),
       subsamples_(subsamples) {
   CHECK_GT(key_id.size(), 0u);
   CHECK(iv.size() == static_cast<size_t>(DecryptConfig::kDecryptionKeySize) ||
         iv.empty());
-  CHECK_GE(data_offset, 0);
 }
 
 DecryptConfig::~DecryptConfig() {}