More prompt-timing cleanups:  Make multi-line expressions
use the asynchronous stream mechanism rather than writing
directly to the Debugger's output & error streams.

llvm-svn: 132930
diff --git a/lldb/source/Commands/CommandObjectExpression.h b/lldb/source/Commands/CommandObjectExpression.h
index 71eb9bf..d0feb6d 100644
--- a/lldb/source/Commands/CommandObjectExpression.h
+++ b/lldb/source/Commands/CommandObjectExpression.h
@@ -89,8 +89,8 @@
 
     bool
     EvaluateExpression (const char *expr,
-                        Stream &output_stream,
-                        Stream &error_stream,
+                        Stream *output_stream,
+                        Stream *error_stream,
                         CommandReturnObject *result = NULL);
 
     CommandOptions m_options;