src/: Update the remaining include paths of string_split.h to its new location.

BUG=175186
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Review URL: https://chromiumcodereview.appspot.com/12473004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@186462 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/printing/backend/cups_helper.cc b/printing/backend/cups_helper.cc
index 14ae2d5..fecd18a2 100644
--- a/printing/backend/cups_helper.cc
+++ b/printing/backend/cups_helper.cc
@@ -9,8 +9,8 @@
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
-#include "base/string_split.h"
 #include "base/string_util.h"
+#include "base/strings/string_split.h"
 #include "base/values.h"
 #include "googleurl/src/gurl.h"
 #include "printing/backend/print_backend.h"