Printing: Convert several wstrings to string16.

printing/printed_pages_source.h

Index: printing/printed_pages_source.h
diff --git a/printing/printed_pages_source.h b/printing/printed_pages_source.h
index ec130dd5b6ab3c4d7edef0ac91d16f981421bdb2..c466072d71a724e4002096ee558cba3e1040ee06 100644
--- a/printing/printed_pages_source.h
+++ b/printing/printed_pages_source.h
@@ -5,7 +5,7 @@
 #ifndef PRINTING_PRINTED_PAGES_SOURCE_H_
 #define PRINTING_PRINTED_PAGES_SOURCE_H_
 
-#include <string>
+#include "base/string16.h"
 
 class GURL;
 class MessageLoop;
@@ -18,7 +18,7 @@ class PrintedDocument;
 class PrintedPagesSource {
  public:
   // Returns the document title.
-  virtual std::wstring RenderSourceName() = 0;
+  virtual string16 RenderSourceName() = 0;
 
   // Returns the URL's source of the document if applicable.
   virtual GURL RenderSourceUrl() = 0;