Move more file_util functions to base namespace.

net/base/file_stream_unittest.cc

Index: net/base/file_stream_unittest.cc
diff --git a/net/base/file_stream_unittest.cc b/net/base/file_stream_unittest.cc
index 6f359854584e816f90b34a07b4a2e692ab19d3f9..b055c78b5d1b981b4311c6819dcce09f46af41b1 100644
--- a/net/base/file_stream_unittest.cc
+++ b/net/base/file_stream_unittest.cc
@@ -200,7 +200,7 @@ TEST_F(FileStreamTest, UseFileHandle) {
 
   // Read into buffer and compare to make sure the handle worked fine.
   ASSERT_EQ(kTestDataSize,
-      file_util::ReadFile(temp_file_path(), buffer, kTestDataSize));
+            base::ReadFile(temp_file_path(), buffer, kTestDataSize));
   ASSERT_EQ(0, memcmp(kTestData, buffer, kTestDataSize));
 }