IPC: Get rid of FileDescriptor usage from FileDescriptorSet and Message

ipc/mojo/ipc_channel_mojo_unittest.cc

Index: ipc/mojo/ipc_channel_mojo_unittest.cc
diff --git a/ipc/mojo/ipc_channel_mojo_unittest.cc b/ipc/mojo/ipc_channel_mojo_unittest.cc
index 2b9a954567fc32eb6d43149c6fa996794450253d..c8d5326f947ae3cba9fe66331639733c2219ddb9 100644
--- a/ipc/mojo/ipc_channel_mojo_unittest.cc
+++ b/ipc/mojo/ipc_channel_mojo_unittest.cc
@@ -281,10 +281,9 @@ class ListenerThatExpectsFile : public IPC::Listener {
 
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
     PickleIterator iter(message);
-    base::FileDescriptor desc;
-    EXPECT_TRUE(message.ReadFileDescriptor(&iter, &desc));
+    base::File file;
+    EXPECT_TRUE(message.ReadFile(&iter, &file));
     std::string content(GetSendingFileContent().size(), ' ');
-    base::File file(desc.fd);
     file.Read(0, &content[0], content.size());
     EXPECT_EQ(content, GetSendingFileContent());
     base::MessageLoop::current()->Quit();
@@ -313,8 +312,7 @@ class ListenerThatExpectsFile : public IPC::Listener {
     file.Flush();
     IPC::Message* message = new IPC::Message(
         0, 2, IPC::Message::PRIORITY_NORMAL);
-    message->WriteFileDescriptor(
-        base::FileDescriptor(file.TakePlatformFile(), false));
+    message->WriteFile(file.Pass());
     ASSERT_TRUE(sender->Send(message));
   }