[LyX/master] Use const ref instead of passing by value.

[Richard Heck]

commit fb4c70650c03d55f8cfb2ea8d312382c86b863f6
Author: Richard Heck <rgh...@lyx.org>
Date:   Tue May 12 12:52:36 2015 -0400

    Use const ref instead of passing by value.
    
    Thinko caught by coverity.

diff --git a/src/insets/InsetTOC.cpp b/src/insets/InsetTOC.cpp
index 11662ce..d413892 100644
--- a/src/insets/InsetTOC.cpp
+++ b/src/insets/InsetTOC.cpp
@@ -149,7 +149,7 @@ void InsetTOC::makeTOCEntry(XHTMLStream & xs,
 
 
 void InsetTOC::makeTOCWithDepth(XHTMLStream & xs, 
-               Toc toc, OutputParams const & op) const
+               Toc const & toc, OutputParams const & op) const
 {
        Toc::const_iterator it = toc.begin();
        Toc::const_iterator const en = toc.end();
@@ -207,7 +207,7 @@ void InsetTOC::makeTOCWithDepth(XHTMLStream & xs,
 
 
 void InsetTOC::makeTOCNoDepth(XHTMLStream & xs, 
-               Toc toc, const OutputParams & op) const
+               Toc const & toc, const OutputParams & op) const
 {
        Toc::const_iterator it = toc.begin();
        Toc::const_iterator const en = toc.end();
diff --git a/src/insets/InsetTOC.h b/src/insets/InsetTOC.h
index 1836836..074ad53 100644
--- a/src/insets/InsetTOC.h
+++ b/src/insets/InsetTOC.h
@@ -64,9 +64,9 @@ public:
 
 private:
        ///
-       void makeTOCWithDepth(XHTMLStream & xs, Toc toc, const OutputParams & 
op) const;
+       void makeTOCWithDepth(XHTMLStream & xs, Toc const & toc, const 
OutputParams & op) const;
        ///
-       void makeTOCNoDepth(XHTMLStream & xs, Toc toc, const OutputParams & op) 
const;
+       void makeTOCNoDepth(XHTMLStream & xs, Toc const & toc, const 
OutputParams & op) const;
        ///
        void makeTOCEntry(XHTMLStream & xs, Paragraph const & par, OutputParams 
const & op) const;