Switch to source-built GSON.

Bug: 243950468
Test: local build, presubmit
Change-Id: I3b800e30b99f52ba0f0fd1d0140cdbad611ba869
1 file changed
tree: 4a85f8efa831b2a85474a9758ca0fb558b19f240
  1. com/
  2. Android.bp
  3. import-maven-artifacts.sh