[api] Regenerate remote APIs.

common/api/buildbucket/swarmbucket/v1/swarmbucket-api.json

 {
  "kind": "discovery#restDescription",
- "etag": "\"RnkXbyw9us4_w3H-FU6An0C4oYs/lsH1QT-cqP1N0YIBt5a4z6BEjfE\"",
+ "etag": "\"RnkXbyw9us4_w3H-FU6An0C4oYs/jlDToyXYcVJZQjtczFF8dW6phEA\"",
  "discoveryVersion": "v1",
  "id": "swarmbucket:v1",
  "name": "swarmbucket",
  "version": "v1",
  "title": "Buildbucket-Swarming integration",
  "description": "API specific to swarmbucket.",
  "icons": {
   "x16": "https://www.gstatic.com/images/branding/product/1x/googleg_16dp.png",
   "x32": "https://www.gstatic.com/images/branding/product/1x/googleg_32dp.png"
  },
@@ skipping 73 matching lines @@
     }
    }
   },
   "ApiPutRequestMessage": {
    "id": "ApiPutRequestMessage",
    "type": "object",
    "properties": {
     "bucket": {
      "type": "string"
     },
+    "canary_preference": {
+     "type": "string",
+     "enum": [
+      "AUTO",
+      "CANARY",
+      "PROD"
+     ],
+     "enumDescriptions": [
+      "",
+      "",
+      ""
+     ]
+    },
     "client_operation_id": {
      "type": "string"
     },
     "lease_expiration_ts": {
      "type": "string",
      "format": "int64"
     },
     "parameters_json": {
      "type": "string"
     },
@@ skipping 96 matching lines @@
    },
    "response": {
     "$ref": "SwarmingSwarmbucketApiGetTaskDefinitionResponseMessage"
    },
    "scopes": [
     "https://www.googleapis.com/auth/userinfo.email"
    ]
   }
  }
 }