old_contents: {
    "targets": [
      {
        "target_name": "objhash",
        "sources": [ "objhash.cc" ]
      }
    ]
  }
new_contents: {
    "targets": [
      {
        "target_name": "objhash",
        "sources": [ "src/objhash.cc" ]
      }
    ]
  }
subject: fix source location in binding