Drop data offset in PP_EncryptedBlockInfo.

ppapi/api/private/pp_content_decryptor.idl

Index: ppapi/api/private/pp_content_decryptor.idl
diff --git a/ppapi/api/private/pp_content_decryptor.idl b/ppapi/api/private/pp_content_decryptor.idl
index 41a399740838b2e38759907c08b142deb1e68b7c..ac9e88b2293312b36a54f91e5fc9cc3575016532 100644
--- a/ppapi/api/private/pp_content_decryptor.idl
+++ b/ppapi/api/private/pp_content_decryptor.idl
@@ -81,7 +81,7 @@ struct PP_DecryptSubsampleDescription {
  * The <code>PP_EncryptedBlockInfo</code> struct contains all the information
  * needed to decrypt an encrypted block.
  */
-[assert_size(248)]
+[assert_size(240)]
 struct PP_EncryptedBlockInfo {
   /**
    * Information needed by the client to track the block to be decrypted.
@@ -94,11 +94,6 @@ struct PP_EncryptedBlockInfo {
   uint32_t data_size;
 
   /**
-   * Size in bytes of data to be discarded before applying the decryption.
-   */
-  uint32_t data_offset;
-
-  /**
    * Key ID of the block to be decrypted.
    *
    * TODO(xhwang): For WebM the key ID can be as large as 2048 bytes in theory.
@@ -121,12 +116,6 @@ struct PP_EncryptedBlockInfo {
    */
   PP_DecryptSubsampleDescription[16] subsamples;
   uint32_t num_subsamples;
-
-  /**
-   * 4-byte padding to make the size of <code>PP_EncryptedBlockInfo</code>
-   * a multiple of 8 bytes. The value of this field should not be used.
-   */
-  uint32_t padding;
 };
 
 /**