Remove the checksum/HMAC code from the decryptor.

webkit/media/crypto/ppapi/content_decryption_module.h

Index: webkit/media/crypto/ppapi/content_decryption_module.h
diff --git a/webkit/media/crypto/ppapi/content_decryption_module.h b/webkit/media/crypto/ppapi/content_decryption_module.h
index 0f2244a5618b0c9e9c5e2399eb150a1f99f5ded7..500fdf191e0ada196e6ba8195bc56f1ab2406e3e 100644
--- a/webkit/media/crypto/ppapi/content_decryption_module.h
+++ b/webkit/media/crypto/ppapi/content_decryption_module.h
@@ -97,8 +97,6 @@ struct InputBuffer {
         key_id_size(0),
         iv(NULL),
         iv_size(0),
-        checksum(NULL),
-        checksum_size(0),
         subsamples(NULL),
         num_subsamples(0),
         timestamp(0) {}
@@ -114,9 +112,6 @@ struct InputBuffer {
   const uint8_t* iv;  // Initialization vector.
   uint32_t iv_size;  // Size (in bytes) of |iv|.
 
-  const uint8_t* checksum;
-  uint32_t checksum_size;  // Size (in bytes) of the |checksum|.
-
   const struct SubsampleEntry* subsamples;
   uint32_t num_subsamples;  // Number of subsamples in |subsamples|.