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

chrome/installer/setup/setup_util_unittest.cc

Index: chrome/installer/setup/setup_util_unittest.cc
diff --git a/chrome/installer/setup/setup_util_unittest.cc b/chrome/installer/setup/setup_util_unittest.cc
index 5cc08b15422660c7e7a53c04499b0f490c78fae4..ec78c5c75a6204f8f1372b514fea9c647bf14dcd 100644
--- a/chrome/installer/setup/setup_util_unittest.cc
+++ b/chrome/installer/setup/setup_util_unittest.cc
@@ -107,7 +107,7 @@ TEST_F(SetupUtilTestWithDir, ApplyDiffPatchTest) {
   base::FilePath dest = work_dir.AppendASCII("archive2.7z");
   EXPECT_EQ(installer::ApplyDiffPatch(src, patch, dest, NULL), 0);
   base::FilePath base = data_dir_.AppendASCII("archive2.7z");
-  EXPECT_TRUE(file_util::ContentsEqual(dest, base));
+  EXPECT_TRUE(base::ContentsEqual(dest, base));
 
   EXPECT_EQ(installer::ApplyDiffPatch(base::FilePath(), base::FilePath(),
                                       base::FilePath(), NULL),