base: Move SplitStringUsingSubstr functions from string_util.h to string_split.h

base/string_util.cc

Index: base/string_util.cc
diff --git a/base/string_util.cc b/base/string_util.cc
index 56aa39de6d3fdf2cb1bbf592303925a7f5046bf0..a7f5258912d3825c0894367ae2cb935349a8d52d 100644
--- a/base/string_util.cc
+++ b/base/string_util.cc
@@ -821,40 +821,6 @@ void SplitStringDontTrim(const std::string& str,
   SplitStringT(str, s, false, r);
 }
 
-template <typename STR>
-static void SplitStringUsingSubstrT(const STR& str,
-                                    const STR& s,
-                                    std::vector<STR>* r) {
-  typename STR::size_type begin_index = 0;
-  while (true) {
-    const typename STR::size_type end_index = str.find(s, begin_index);
-    if (end_index == STR::npos) {
-      const STR term = str.substr(begin_index);
-      STR tmp;
-      TrimWhitespace(term, TRIM_ALL, &tmp);
-      r->push_back(tmp);
-      return;
-    }
-    const STR term = str.substr(begin_index, end_index - begin_index);
-    STR tmp;
-    TrimWhitespace(term, TRIM_ALL, &tmp);
-    r->push_back(tmp);
-    begin_index = end_index + s.size();
-  }
-}
-
-void SplitStringUsingSubstr(const string16& str,
-                            const string16& s,
-                            std::vector<string16>* r) {
-  SplitStringUsingSubstrT(str, s, r);
-}
-
-void SplitStringUsingSubstr(const std::string& str,
-                            const std::string& s,
-                            std::vector<std::string>* r) {
-  SplitStringUsingSubstrT(str, s, r);
-}
-
 template<typename STR>
 static size_t TokenizeT(const STR& str,
                         const STR& delimiters,