Fixed multiline expressions, and removed some dead code.

IOHandlerLinesUpdated() does nothing, and IOHandlerIsInputComplete should be
implemented but isn't.  This means that multiline expressions don't work.  This
patch fixes that.  Test case to follow in the next commit.

llvm-svn: 268970
diff --git a/lldb/source/Commands/CommandObjectExpression.h b/lldb/source/Commands/CommandObjectExpression.h
index f26ee7a..312e9fe6 100644
--- a/lldb/source/Commands/CommandObjectExpression.h
+++ b/lldb/source/Commands/CommandObjectExpression.h
@@ -82,12 +82,11 @@
     void
     IOHandlerInputComplete(IOHandler &io_handler,
 			   std::string &line) override;
-
-    virtual LineStatus
-    IOHandlerLinesUpdated (IOHandler &io_handler,
-                           StringList &lines,
-                           uint32_t line_idx,
-                           Error &error);
+    
+    bool
+    IOHandlerIsInputComplete (IOHandler &io_handler,
+                              StringList &lines) override;
+    
     bool
     DoExecute(const char *command,
 	      CommandReturnObject &result) override;