Merge definitions of PlatformFileToInt and IntToPlatformFile to one place.

ppapi/proxy/broker_dispatcher.cc

Index: ppapi/proxy/broker_dispatcher.cc
diff --git a/ppapi/proxy/broker_dispatcher.cc b/ppapi/proxy/broker_dispatcher.cc
index 30cee185aad16a20e386e64ead7f650ad728a87f..c3f3b47bc59b6b24fa5d7c6937b70687d2fe8664 100644
--- a/ppapi/proxy/broker_dispatcher.cc
+++ b/ppapi/proxy/broker_dispatcher.cc
@@ -7,24 +7,11 @@
 #include "base/sync_socket.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/shared_impl/platform_file.h"
 
 namespace ppapi {
 namespace proxy {
 
-namespace {
-
-int32_t PlatformFileToInt(base::PlatformFile handle) {
-#if defined(OS_WIN)
-  return static_cast<int32_t>(reinterpret_cast<intptr_t>(handle));
-#elif defined(OS_POSIX)
-  return handle;
-#else
-  #error Not implemented.
-#endif
-}
-
-}  // namespace
-
 BrokerDispatcher::BrokerDispatcher(base::ProcessHandle remote_process_handle,
                                    PP_ConnectInstance_Func connect_instance)
     : ProxyChannel(remote_process_handle),
@@ -66,7 +53,8 @@ void BrokerDispatcher::OnMsgConnectToPlugin(
         IPC::PlatformFileForTransitToPlatformFile(handle);
 
     if (connect_instance_) {
-      *result = connect_instance_(instance, PlatformFileToInt(socket_handle));
+      *result = connect_instance_(instance,
+                                  ppapi::PlatformFileToInt(socket_handle));
     } else {
       *result = PP_ERROR_FAILED;
       // Close the handle since there is no other owner.