Add external/cronet to manifest

Test: repo sync
Bug: b/263150094
Change-Id: I1eb33159f820fc89c044c09f5d7483f0cfd08faf
1 file changed
tree: 3af7d0c7f01817fb3e0ef16bf31cde3b1f721549
  1. default.xml
  2. GLOBAL-PREUPLOAD.cfg
  3. OWNERS