update_engine: Update libchrome APIs to r369476

The new libchrome has been ported from Chromium and some APIs have
changed. Make necessary changes at call sites.

Change-Id: I42e65bda7f1dbdf6f6e0ebf356d2cfea6b729193
diff --git a/payload_consumer/download_action.h b/payload_consumer/download_action.h
index 300d97e..4074fdd 100644
--- a/payload_consumer/download_action.h
+++ b/payload_consumer/download_action.h
@@ -168,7 +168,7 @@
 
 // We want to be sure that we're compiled with large file support on linux,
 // just in case we find ourselves downloading large images.
-COMPILE_ASSERT(8 == sizeof(off_t), off_t_not_64_bit);
+static_assert(8 == sizeof(off_t), "off_t not 64 bit");
 
 }  // namespace chromeos_update_engine