First batch of changes to make analyzer package strong mode error free

pkg/analyzer/lib/src/services/lint.dart

Index: pkg/analyzer/lib/src/services/lint.dart
diff --git a/pkg/analyzer/lib/src/services/lint.dart b/pkg/analyzer/lib/src/services/lint.dart
index 3eea1b7c327025695a510eac3a1adc4d0dd2373d..3b364572d68e3d8d9a09085a4d8ed289cc8763a9 100644
--- a/pkg/analyzer/lib/src/services/lint.dart
+++ b/pkg/analyzer/lib/src/services/lint.dart
@@ -25,7 +25,8 @@ LintRegistry lintRegistry = new LintRegistry();
 /// Return lints associated with this [context], or an empty list if there are
 /// none.
 List<Linter> getLints(AnalysisContext context) =>
-    context.getConfigurationData(CONFIGURED_LINTS_KEY) ?? _noLints;
+    context.getConfigurationData(CONFIGURED_LINTS_KEY) as List<Linter> ??
+    _noLints;
 
 /// Associate these [lints] with the given [context].
 void setLints(AnalysisContext context, List<Linter> lints) {