base: Move SplitString functions into the base namespace and update the callers.

base/string_split.cc

Index: base/string_split.cc
diff --git a/base/string_split.cc b/base/string_split.cc
index ca979541aee959e60d713438cbb3e6a921892533..1075610f2c194954782b0aa370063ab885eb31f9 100644
--- a/base/string_split.cc
+++ b/base/string_split.cc
@@ -9,6 +9,8 @@
 #include "base/third_party/icu/icu_utf.h"
 #include "base/utf_string_conversions.h"
 
+namespace base {
+
 template<typename STR>
 static void SplitStringT(const STR& str,
                          const typename STR::value_type s,
@@ -55,8 +57,6 @@ void SplitString(const std::string& str,
   SplitStringT(str, c, true, r);
 }
 
-namespace base {
-
 bool SplitStringIntoKeyValues(
     const std::string& line,
     char key_value_delimiter,