PPAPI/NaCl: Make NaClIPCAdapter transfer handles more generally

ppapi/shared_impl/ppb_audio_shared.cc

Index: ppapi/shared_impl/ppb_audio_shared.cc
diff --git a/ppapi/shared_impl/ppb_audio_shared.cc b/ppapi/shared_impl/ppb_audio_shared.cc
index 1a62130a9cbeeaabfe169d16fc81b3a3478819dc..4d37b576a1cfbdc8c331fe0eb3612e5c6a04c3b2 100644
--- a/ppapi/shared_impl/ppb_audio_shared.cc
+++ b/ppapi/shared_impl/ppb_audio_shared.cc
@@ -93,7 +93,8 @@ void PPB_Audio_Shared::SetStreamInfo(
   shared_memory_.reset(new base::SharedMemory(shared_memory_handle, false));
   shared_memory_size_ = shared_memory_size;
 
-  if (!shared_memory_->Map(TotalSharedMemorySizeInBytes(shared_memory_size_))) {
+  if (!shared_memory_->Map(TotalSharedMemorySizeInBytes(
+          static_cast<uint32>(shared_memory_size_)))) {
     PpapiGlobals::Get()->LogWithSource(instance, PP_LOGLEVEL_WARNING, "",
       "Failed to map shared memory for PPB_Audio_Shared.");
   }
@@ -168,11 +169,12 @@ void PPB_Audio_Shared::Run() {
   while (sizeof(pending_data) ==
       socket_->Receive(&pending_data, sizeof(pending_data)) &&
       pending_data != kPauseMark) {
-    callback_(buffer, shared_memory_size_, user_data_);
+    callback_(buffer, static_cast<uint32_t>(shared_memory_size_), user_data_);
 
     // Let the host know we are done.
-    SetActualDataSizeInBytes(shared_memory_.get(), shared_memory_size_,
-        shared_memory_size_);
+    SetActualDataSizeInBytes(shared_memory_.get(),
+                             static_cast<uint32>(shared_memory_size_),
+                             static_cast<uint32>(shared_memory_size_));
   }
 }