Convert most of base and net to use base::File

net/disk_cache/simple/simple_util.h

Index: net/disk_cache/simple/simple_util.h
diff --git a/net/disk_cache/simple/simple_util.h b/net/disk_cache/simple/simple_util.h
index f76215121a41a158f2c0819a357e07fbb1342172..b6ca85bb23be044c63296202e408ee183449e2de 100644
--- a/net/disk_cache/simple/simple_util.h
+++ b/net/disk_cache/simple/simple_util.h
@@ -66,7 +66,7 @@ NET_EXPORT_PRIVATE int64 GetFileSizeFromKeyAndDataSize(const std::string& key,
 NET_EXPORT_PRIVATE int GetFileIndexFromStreamIndex(int stream_index);
 
 // Fills |out_time| with the time the file last modified time. Unlike the
-// functions in platform_file.h, the time resolution is milliseconds.
+// functions in file.h, the time resolution is milliseconds.
 NET_EXPORT_PRIVATE bool GetMTime(const base::FilePath& path,
                                  base::Time* out_mtime);
 }  // namespace simple_backend