Move Posix file utils to the base namespace.

chrome/browser/chromeos/drive/file_system/download_operation_unittest.cc

Index: chrome/browser/chromeos/drive/file_system/download_operation_unittest.cc
diff --git a/chrome/browser/chromeos/drive/file_system/download_operation_unittest.cc b/chrome/browser/chromeos/drive/file_system/download_operation_unittest.cc
index cbb75ded134102b69db3d12b37da57ca431931b9..e9f8a29f4ecf781ab7e6df6db09a03e4ce907102 100644
--- a/chrome/browser/chromeos/drive/file_system/download_operation_unittest.cc
+++ b/chrome/browser/chromeos/drive/file_system/download_operation_unittest.cc
@@ -64,11 +64,11 @@ TEST_F(DownloadOperationTest,
 
   // Verify that readable permission is set.
   int permission = 0;
-  EXPECT_TRUE(file_util::GetPosixFilePermissions(file_path, &permission));
-  EXPECT_EQ(file_util::FILE_PERMISSION_READ_BY_USER |
-            file_util::FILE_PERMISSION_WRITE_BY_USER |
-            file_util::FILE_PERMISSION_READ_BY_GROUP |
-            file_util::FILE_PERMISSION_READ_BY_OTHERS, permission);
+  EXPECT_TRUE(base::GetPosixFilePermissions(file_path, &permission));
+  EXPECT_EQ(base::FILE_PERMISSION_READ_BY_USER |
+            base::FILE_PERMISSION_WRITE_BY_USER |
+            base::FILE_PERMISSION_READ_BY_GROUP |
+            base::FILE_PERMISSION_READ_BY_OTHERS, permission);
 }
 
 TEST_F(DownloadOperationTest,