Enable size_t to int truncation warnings in PPAPI

ppapi/proxy/ppp_content_decryptor_private_proxy.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/proxy/ppp_content_decryptor_private_proxy.h"
 
 #include "base/files/file.h"
 #include "media/base/limits.h"
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/ppb_core.h"
@@ skipping 526 matching lines @@
       server_certificate.size() > media::limits::kMaxCertificateLength) {
     NOTREACHED();
     return;
   }
 
   if (ppp_decryptor_impl_) {
     ScopedPPVar server_certificate_var(
         ScopedPPVar::PassRef(),
         PpapiGlobals::Get()
             ->GetVarTracker()
-            ->MakeArrayBufferPPVar(server_certificate.size(),
-                                   &server_certificate[0]));
+            ->MakeArrayBufferPPVar(
+                static_cast<uint32_t>(server_certificate.size()),
+                &server_certificate[0]));
     CallWhileUnlocked(ppp_decryptor_impl_->SetServerCertificate,
                       instance,
                       promise_id,
                       server_certificate_var.get());
   }
 }
 
 void PPP_ContentDecryptor_Private_Proxy::OnMsgCreateSessionAndGenerateRequest(
     PP_Instance instance,
     uint32_t promise_id,
@@ skipping 177 matching lines @@
         ppp_decryptor_impl_->DecryptAndDecode,
         instance,
         decoder_type,
         plugin_resource.get(),
         &block_info);
   }
 }
 
 }  // namespace proxy
 }  // namespace ppapi