Merge definitions of PlatformFileToInt and IntToPlatformFile to one place.

content/renderer/pepper_plugin_delegate_impl.cc

Index: content/renderer/pepper_plugin_delegate_impl.cc
diff --git a/content/renderer/pepper_plugin_delegate_impl.cc b/content/renderer/pepper_plugin_delegate_impl.cc
index 94bbaf0e4cce424d697c16076a095b7b1920c4a2..5137463edaeeab9f2845b33674c700b066d01151 100644
--- a/content/renderer/pepper_plugin_delegate_impl.cc
+++ b/content/renderer/pepper_plugin_delegate_impl.cc
@@ -75,20 +75,11 @@
 #include "webkit/plugins/ppapi/resource_helper.h"
 #include "webkit/plugins/webplugininfo.h"
 
+using ppapi::proxy::PlatformFileToInt;
 using WebKit::WebView;
 
 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
-}
-
 base::SyncSocket::Handle DuplicateHandle(base::SyncSocket::Handle handle) {
   base::SyncSocket::Handle out_handle = base::kInvalidPlatformFileValue;
 #if defined(OS_WIN)