Return void from all PPP CDM API interface methods

ppapi/cpp/private/content_decryptor_private.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_
 #define PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_
 
 #include "ppapi/c/private/pp_content_decryptor.h"
 #include "ppapi/c/private/ppb_content_decryptor_private.h"
 #include "ppapi/c/private/ppp_content_decryptor_private.h"
@@ skipping 10 matching lines @@
 class ContentDecryptor_Private {
  public:
   explicit ContentDecryptor_Private(Instance* instance);
   virtual ~ContentDecryptor_Private();
 
   // PPP_ContentDecryptor_Private functions exposed as virtual functions
   // for you to override.
   // TODO(tomfinegan): This could be optimized to pass pp::Var instead of
   // strings. The change would allow the CDM wrapper to reuse vars when
   // replying to the browser.
-  virtual bool GenerateKeyRequest(const std::string& key_system,
+  virtual void GenerateKeyRequest(const std::string& key_system,
                                   pp::VarArrayBuffer init_data) = 0;
-  virtual bool AddKey(const std::string& session_id,
+  virtual void AddKey(const std::string& session_id,
                       pp::VarArrayBuffer key,
                       pp::VarArrayBuffer init_data) = 0;
-  virtual bool CancelKeyRequest(const std::string& session_id) = 0;
-  virtual bool Decrypt(pp::Buffer_Dev encrypted_buffer,
+  virtual void CancelKeyRequest(const std::string& session_id) = 0;
+  virtual void Decrypt(pp::Buffer_Dev encrypted_buffer,
                        const PP_EncryptedBlockInfo& encrypted_block_info) = 0;
-  virtual bool DecryptAndDecode(
+  virtual void DecryptAndDecode(
       pp::Buffer_Dev encrypted_buffer,
       const PP_EncryptedBlockInfo& encrypted_block_info) = 0;
 
   // PPB_ContentDecryptor_Private methods for passing data from the decryptor
   // to the browser.
   void NeedKey(const std::string& key_system,
                const std::string& session_id,
                pp::VarArrayBuffer init_data);
   void KeyAdded(const std::string& key_system,
                 const std::string& session_id);
@@ skipping 12 matching lines @@
   void DeliverSamples(pp::Buffer_Dev decrypted_samples,
                       const PP_DecryptedBlockInfo& decrypted_block_info);
 
  private:
   InstanceHandle associated_instance_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_