Regenerate the codegen files to sync with the latest version. (#1640)

Author: jmuk

packages/language/package.json

@@ -53,10 +53,9 @@
   ],
   "dependencies": {
     "@google-cloud/common": "^0.6.0",
-    "arguejs": "^0.2.3",
     "arrify": "^1.0.1",
     "extend": "^3.0.0",
-    "google-gax": "^0.6.0",
+    "google-gax": "^0.7.0",
     "google-proto-files": "^0.8.0",
     "is": "^3.0.1",
     "propprop": "^0.3.1",