Enable size_t to int truncation warnings in PPAPI

ppapi/cpp/private/content_decryptor_private.cc

 // 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.
 
 #include "ppapi/cpp/private/content_decryptor_private.h"
 
 #include <cstring>  // memcpy
 
 #include "ppapi/c/ppb_var.h"
 #include "ppapi/c/private/ppb_content_decryptor_private.h"
@@ skipping 311 matching lines @@
 }
 
 void ContentDecryptor_Private::SessionKeysChange(
     const std::string& session_id,
     bool has_additional_usable_key,
     const std::vector<PP_KeyInformation>& key_information) {
   if (has_interface<PPB_ContentDecryptor_Private>()) {
     pp::Var session_id_var(session_id);
     get_interface<PPB_ContentDecryptor_Private>()->SessionKeysChange(
         associated_instance_.pp_instance(), session_id_var.pp_var(),
-        PP_FromBool(has_additional_usable_key), key_information.size(),
+        PP_FromBool(has_additional_usable_key),
+        static_cast<uint32_t>(key_information.size()),
         key_information.empty() ? NULL : &key_information[0]);
   }
 }
 
 void ContentDecryptor_Private::SessionExpirationChange(
     const std::string& session_id,
     PP_Time new_expiry_time) {
   if (has_interface<PPB_ContentDecryptor_Private>()) {
     pp::Var session_id_var(session_id);
     get_interface<PPB_ContentDecryptor_Private>()->SessionExpirationChange(
@@ skipping 86 matching lines @@
     const PP_DecryptedSampleInfo& decrypted_sample_info) {
   if (has_interface<PPB_ContentDecryptor_Private>()) {
     get_interface<PPB_ContentDecryptor_Private>()->DeliverSamples(
         associated_instance_.pp_instance(),
         audio_frames.pp_resource(),
         &decrypted_sample_info);
   }
 }
 
 }  // namespace pp