Use the exact-width integer types defined in <stdint.h> rather than

net/base/file_stream.h

Index: net/base/file_stream.h
diff --git a/net/base/file_stream.h b/net/base/file_stream.h
index 89db65e15b5ae49e50de78874e64c3babf7df640..1524da529716bcd5edf21f436a2ddec076c8b8f3 100644
--- a/net/base/file_stream.h
+++ b/net/base/file_stream.h
@@ -68,7 +68,8 @@ class NET_EXPORT FileStream {
   // relative to the start of the file.  Otherwise, an error code is returned.
   // It is invalid to request any asynchronous operations while there is an
   // in-flight asynchronous operation.
-  virtual int Seek(base::File::Whence whence, int64 offset,
+  virtual int Seek(base::File::Whence whence,
+                   int64_t offset,
                    const Int64CompletionCallback& callback);
 
   // Call this method to read data from the current stream position