Delete some unused code found by -Wunused-function

chrome/browser/sessions/base_session_service.cc

Index: chrome/browser/sessions/base_session_service.cc
diff --git a/chrome/browser/sessions/base_session_service.cc b/chrome/browser/sessions/base_session_service.cc
index b89c6a31e64c38edc8914e8113c33e5d97293ab2..7f3385e102ec83d6451eb730a6792ed1029491e6 100644
--- a/chrome/browser/sessions/base_session_service.cc
+++ b/chrome/browser/sessions/base_session_service.cc
@@ -52,18 +52,6 @@ void WriteStringToPickle(Pickle& pickle, int* bytes_written, int max_bytes,
   }
 }
 
-// string16 version of WriteStringToPickle.
-void WriteString16ToPickle(Pickle& pickle, int* bytes_written, int max_bytes,
-                           const string16& str) {
-  int num_bytes = str.size() * sizeof(char16);
-  if (*bytes_written + num_bytes < max_bytes) {
-    *bytes_written += num_bytes;
-    pickle.WriteString16(str);
-  } else {
-    pickle.WriteString16(string16());
-  }
-}
-
 }  // namespace
 
 // Delay between when a command is received, and when we save it to the