Convert base dependencies to use sys_string_conversions instead of the ICU...

base/file_util.cc

Index: base/file_util.cc
===================================================================
--- base/file_util.cc	(revision 28166)
+++ base/file_util.cc	(working copy)
@@ -13,11 +13,10 @@
 
 #include "base/file_path.h"
 #include "base/logging.h"
+#include "base/string_piece.h"
 #include "base/string_util.h"
+#include "base/utf_string_conversions.h"
 
-#include "base/string_piece.h"
-#include "base/sys_string_conversions.h"
-
 namespace {
 
 const FilePath::CharType kExtensionSeparator = FILE_PATH_LITERAL('.');