Move PathIsWritable, DirectoryExists, ContentsEqual, and TextContentsEqual to the base namespace.

base/json/json_value_serializer_unittest.cc

Index: base/json/json_value_serializer_unittest.cc
diff --git a/base/json/json_value_serializer_unittest.cc b/base/json/json_value_serializer_unittest.cc
index ce7129fa2ed42862babce124587a6701abd97be0..519af848f3e52b5ae647288ec5b1656e1ef935f3 100644
--- a/base/json/json_value_serializer_unittest.cc
+++ b/base/json/json_value_serializer_unittest.cc
@@ -423,8 +423,7 @@ TEST_F(JSONFileValueSerializerTest, Roundtrip) {
   ASSERT_TRUE(PathExists(written_file_path));
 
   // Now compare file contents.
-  EXPECT_TRUE(file_util::TextContentsEqual(original_file_path,
-                                           written_file_path));
+  EXPECT_TRUE(TextContentsEqual(original_file_path, written_file_path));
   EXPECT_TRUE(base::Delete(written_file_path, false));
 }
 
@@ -451,8 +450,7 @@ TEST_F(JSONFileValueSerializerTest, RoundtripNested) {
   ASSERT_TRUE(PathExists(written_file_path));
 
   // Now compare file contents.
-  EXPECT_TRUE(file_util::TextContentsEqual(original_file_path,
-                                           written_file_path));
+  EXPECT_TRUE(TextContentsEqual(original_file_path, written_file_path));
   EXPECT_TRUE(base::Delete(written_file_path, false));
 }