Roll Observatory deps (charted -> ^0.3.0)

packages/dart_style/test/regression/0400/0407.unit

+>>>
+void main() {
+  model..account = (new Account()
+    ..accountId = new Int64(111)
+    ..tags = (new Account_Tags()..accountHotlist.add(new Hotlist()..hotlistId = new Int64(10))));
+}
+<<<
+void main() {
+  model
+    ..account = (new Account()
+      ..accountId = new Int64(111)
+      ..tags = (new Account_Tags()
+        ..accountHotlist.add(new Hotlist()..hotlistId = new Int64(10))));
+}
+>>> (indent 4)
+main() {
+receiver
+      ..formattedTotal = _total == 0
+          ? ""
+          : _chartType == "PieChart"
+              ? _formatter.formatAsPercent(item.value / _total, fractionDigits: 1)
+              : _formatter.formatValue(item.value, item.valueType);
+}
+<<<
+    main() {
+      receiver
+        ..formattedTotal = _total == 0
+            ? ""
+            : _chartType == "PieChart"
+                ? _formatter.formatAsPercent(item.value / _total,
+                    fractionDigits: 1)
+                : _formatter.formatValue(item.value, item.valueType);
+    }