Move ReadFileToString to the base namespace.

BUG=

Review URL: https://codereview.chromium.org/19579005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@220612 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 82f84b91a10f513cd59b8382a7ab00ed0f179bd5
diff --git a/base/json/json_reader_unittest.cc b/base/json/json_reader_unittest.cc
index 527cb97..eceb538 100644
--- a/base/json/json_reader_unittest.cc
+++ b/base/json/json_reader_unittest.cc
@@ -547,7 +547,7 @@
   ASSERT_TRUE(base::PathExists(path));
 
   std::string input;
-  ASSERT_TRUE(file_util::ReadFileToString(
+  ASSERT_TRUE(ReadFileToString(
       path.Append(FILE_PATH_LITERAL("bom_feff.json")), &input));
 
   JSONReader reader;