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

chrome/browser/download/download_path_reservation_tracker_unittest.cc

Index: chrome/browser/download/download_path_reservation_tracker_unittest.cc
diff --git a/chrome/browser/download/download_path_reservation_tracker_unittest.cc b/chrome/browser/download/download_path_reservation_tracker_unittest.cc
index 67a3dfbba36a0cb59f1e38f6f74bdd1c9e31b64d..6ac7b451cadd5687432ace3c7eafa75af3f60278 100644
--- a/chrome/browser/download/download_path_reservation_tracker_unittest.cc
+++ b/chrome/browser/download/download_path_reservation_tracker_unittest.cc
@@ -500,7 +500,7 @@ TEST_F(DownloadPathReservationTrackerTest, CreateDefaultDownloadPath) {
   base::FilePath path(
       GetPathInDownloadsDirectory(FILE_PATH_LITERAL("foo/foo.txt")));
   base::FilePath dir(path.DirName());
-  ASSERT_FALSE(file_util::DirectoryExists(dir));
+  ASSERT_FALSE(base::DirectoryExists(dir));
   DownloadPathReservationTracker::FilenameConflictAction conflict_action =
     DownloadPathReservationTracker::OVERWRITE;
   bool create_directory = false;
@@ -535,7 +535,7 @@ TEST_F(DownloadPathReservationTrackerTest, CreateDefaultDownloadPath) {
         &verified);
     // Verification succeeds because the directory is created.
     EXPECT_TRUE(verified);
-    EXPECT_TRUE(file_util::DirectoryExists(dir));
+    EXPECT_TRUE(base::DirectoryExists(dir));
     item->SetState(DownloadItem::COMPLETE);
   }
 }