Use null-aware operators to clean up the code

pkg/analyzer/lib/src/task/strong/info.dart

Index: pkg/analyzer/lib/src/task/strong/info.dart
diff --git a/pkg/analyzer/lib/src/task/strong/info.dart b/pkg/analyzer/lib/src/task/strong/info.dart
index 41703e12a13f9ba325536ab51ca59d45ff62c30c..39885cde81b47963bf1998efb2e7fa89710e752d 100644
--- a/pkg/analyzer/lib/src/task/strong/info.dart
+++ b/pkg/analyzer/lib/src/task/strong/info.dart
@@ -212,10 +212,7 @@ class DynamicInvoke extends CoercionInfo {
   toErrorCode() => new HintCode(name, message);
 
   /// Whether this [node] is the target of a dynamic operation.
-  static bool get(AstNode node) {
-    var value = node.getProperty(_propertyName);
-    return value != null ? value : false;
-  }
+  static bool get(AstNode node) => node.getProperty(_propertyName) ?? false;
 
   /// Sets whether this node is the target of a dynamic operation.
   static bool set(AstNode node, bool value) {