Move more file_util functions to base namespace.

media/base/container_names_unittest.cc

Index: media/base/container_names_unittest.cc
diff --git a/media/base/container_names_unittest.cc b/media/base/container_names_unittest.cc
index 0cd2c3c3c7e1ca48adf9144992bfac43cea97c2e..c7d40d45afc34642df101e0c17332bc6dda0d637 100644
--- a/media/base/container_names_unittest.cc
+++ b/media/base/container_names_unittest.cc
@@ -111,7 +111,7 @@ void TestFile(MediaContainerName expected, const base::FilePath& filename) {
   int64 actual_size;
   if (base::GetFileSize(filename, &actual_size) && actual_size < read_size)
     read_size = actual_size;
-  int read = file_util::ReadFile(filename, buffer, read_size);
+  int read = base::ReadFile(filename, buffer, read_size);
 
   // Now verify the type.
   EXPECT_EQ(expected,