IPC: Get rid of FileDescriptor usage from FileDescriptorSet and Message

ipc/ipc_message.h

Index: ipc/ipc_message.h
diff --git a/ipc/ipc_message.h b/ipc/ipc_message.h
index 198e6c0a9e59eeb4274cdae838577b909e3ab797..a0dce4fa5e351667dc231ff039326358ab5a98d8 100644
--- a/ipc/ipc_message.h
+++ b/ipc/ipc_message.h
@@ -9,6 +9,7 @@
 
 #include "base/basictypes.h"
 #include "base/debug/trace_event.h"
+#include "base/files/file.h"
 #include "base/pickle.h"
 #include "ipc/ipc_export.h"
 
@@ -20,10 +21,6 @@
 #include "base/memory/ref_counted.h"
 #endif
 
-namespace base {
-struct FileDescriptor;
-}
-
 class FileDescriptorSet;
 
 namespace IPC {
@@ -178,12 +175,12 @@ class IPC_EXPORT Message : public Pickle {
   // This is used to pass a file descriptor to the peer of an IPC channel.
 
   // Add a descriptor to the end of the set. Returns false if the set is full.
-  bool WriteFileDescriptor(const base::FileDescriptor& descriptor);
+  bool WriteFile(base::File descriptor);
+  bool WriteBorrowingFile(const base::PlatformFile& descriptor);
 
   // Get a file descriptor from the message. Returns false on error.
   //   iter: a Pickle iterator to the current location in the message.
-  bool ReadFileDescriptor(PickleIterator* iter,
-                          base::FileDescriptor* descriptor) const;
+  bool ReadFile(PickleIterator* iter, base::File* file) const;
 
   // Returns true if there are any file descriptors in this message.
   bool HasFileDescriptors() const;