Deprecate FileUriResolver and RelativeFileUriResolver in source_io.dart, replace the usages with Re…

pkg/analyzer/lib/src/generated/source_io.dart

Index: pkg/analyzer/lib/src/generated/source_io.dart
diff --git a/pkg/analyzer/lib/src/generated/source_io.dart b/pkg/analyzer/lib/src/generated/source_io.dart
index b7cb0fd5373789875a2b4a022b6f301df7d4c82d..5414d83b910c03291228df8175bfc8efca2be974 100644
--- a/pkg/analyzer/lib/src/generated/source_io.dart
+++ b/pkg/analyzer/lib/src/generated/source_io.dart
@@ -263,6 +263,7 @@ class FileBasedSource extends Source {
 /**
  * Instances of the class `FileUriResolver` resolve `file` URI's.
  */
+@deprecated
 class FileUriResolver extends UriResolver {
   /**
    * The name of the `file` scheme.
@@ -517,6 +518,7 @@ class PackageUriResolver extends UriResolver {
 /**
  * Instances of the class `RelativeFileUriResolver` resolve `file` URI's.
  */
+@deprecated
 class RelativeFileUriResolver extends UriResolver {
   /**
    * The name of the `file` scheme.