Remove embedder locator from analysis context

pkg/analyzer/lib/source/embedder.dart

Index: pkg/analyzer/lib/source/embedder.dart
diff --git a/pkg/analyzer/lib/source/embedder.dart b/pkg/analyzer/lib/source/embedder.dart
index 2ad20d6613ae38364d8578b49149f2c550296538..56abc6a586c848014abadeae93ef46263b12962d 100644
--- a/pkg/analyzer/lib/source/embedder.dart
+++ b/pkg/analyzer/lib/source/embedder.dart
@@ -187,7 +187,7 @@ class EmbedderYamlLocator {
 
   EmbedderYamlLocator(Map<String, List<Folder>> packageMap) {
     if (packageMap != null) {
-      refresh(packageMap);
+      _processPackageMap(packageMap);
     }
   }
 
@@ -199,10 +199,9 @@ class EmbedderYamlLocator {
   void refresh(Map<String, List<Folder>> packageMap) {
     // Clear existing.
     embedderYamls.clear();
-    if (packageMap == null) {
-      return;
+    if (packageMap != null) {
+      _processPackageMap(packageMap);
     }
-    packageMap.forEach(_processPackage);
   }
 
   /// Given the yaml for an embedder ([embedderYaml]) and a folder
@@ -231,6 +230,10 @@ class EmbedderYamlLocator {
     }
   }
 
+  void _processPackageMap(Map<String, List<Folder>> packageMap) {
+    packageMap.forEach(_processPackage);
+  }
+
   /// Read the contents of [libDir]/[EMBEDDER_FILE_NAME] as a string.
   /// Returns null if the file doesn't exist.
   String _readEmbedderYaml(Folder libDir) {