Remove old C++03 move emulation code.

net/base/file_stream_context.h

Index: net/base/file_stream_context.h
diff --git a/net/base/file_stream_context.h b/net/base/file_stream_context.h
index c1846c460d354a58b98d45b3d8694d5edf7f8651..a42634d158a5deacff19740bb9123d2f3c5ac4c2 100644
--- a/net/base/file_stream_context.h
+++ b/net/base/file_stream_context.h
@@ -110,13 +110,12 @@ class FileStream::Context {
   };
 
   struct OpenResult {
-    MOVE_ONLY_TYPE_FOR_CPP_03(OpenResult, RValue)
+    MOVE_ONLY_TYPE_FOR_CPP_03(OpenResult)
    public:
     OpenResult();
     OpenResult(base::File file, IOResult error_code);
-    // C++03 move emulation of this type.
-    OpenResult(RValue other);
-    OpenResult& operator=(RValue other);
+    OpenResult(OpenResult&& other);
+    OpenResult& operator=(OpenResult&& other);
 
     base::File file;
     IOResult error_code;