Revert "add warning for deprecated .analysis_options file name"

pkg/analyzer/lib/src/task/options.dart

Index: pkg/analyzer/lib/src/task/options.dart
diff --git a/pkg/analyzer/lib/src/task/options.dart b/pkg/analyzer/lib/src/task/options.dart
index c23b71e1aeab74fb0a8221e291a5f747bf2169ee..050d3bce27f8843cf8cde03cf5f6bde82a5fa1f5 100644
--- a/pkg/analyzer/lib/src/task/options.dart
+++ b/pkg/analyzer/lib/src/task/options.dart
@@ -238,18 +238,6 @@ class GenerateOptionsErrorsTask extends SourceBasedAnalysisTask {
     Source initialSource = source;
     SourceSpan initialIncludeSpan;
 
-    // Suggest user rename deprecated .analysis_options file
-    String fullName = target?.source?.fullName;
-    if (fullName != null &&
-        fullName.endsWith(AnalysisEngine.ANALYSIS_OPTIONS_FILE)) {
-      errors.add(new AnalysisError(
-          source,
-          0, // offset
-          1, // length
-          AnalysisOptionsWarningCode.DEPRECATED_ANALYSIS_OPTIONS_FILE_NAME,
-          [fullName]));
-    }
-
     // Validate the specified options and any included option files
     void validate(Source source, Map<String, YamlNode> options) {
       List<AnalysisError> validationErrors =