Revert "Allow patch files to add top-level declarations to the patched library."

lib/compiler/implementation/scanner/class_element_parser.dart

Index: lib/compiler/implementation/scanner/class_element_parser.dart
diff --git a/lib/compiler/implementation/scanner/class_element_parser.dart b/lib/compiler/implementation/scanner/class_element_parser.dart
index 46012f3044f79cff64dc47f8be313d4d7ea47c38..74e0a76f0d0452625543354b2e9a36a866c8f551 100644
--- a/lib/compiler/implementation/scanner/class_element_parser.dart
+++ b/lib/compiler/implementation/scanner/class_element_parser.dart
@@ -18,7 +18,7 @@ class PartialClassElement extends ClassElement {
                       Token this.endToken,
                       CompilationUnitElement enclosing,
                       int id)
-      : super(name, enclosing, id);
+    : super(name, enclosing, id);
 
   ClassNode parseNode(DiagnosticListener diagnosticListener) {
     if (cachedNode != null) return cachedNode;
@@ -34,17 +34,6 @@ class PartialClassElement extends ClassElement {
   Token position() => beginToken;
 
   bool isInterface() => beginToken.stringValue === "interface";
-
-  PartialClassElement cloneTo(CompilationUnitElement enclosing,
-                              DiagnosticListener listener) {
-    parseNode(listener);
-    PartialClassElement result =
-        new PartialClassElement(name, beginToken, endToken, enclosing, id);
-    cloneMembersTo(result, listener);
-    result.cachedNode = cachedNode;
-    result.scriptOverride = getScript();
-    return result;
-  }
 }
 
 class MemberListener extends NodeListener {
@@ -52,8 +41,8 @@ class MemberListener extends NodeListener {
 
   MemberListener(DiagnosticListener listener,
                  Element enclosingElement)
-      : this.enclosingElement = enclosingElement,
-        super(listener, enclosingElement.getCompilationUnit());
+    : this.enclosingElement = enclosingElement,
+      super(listener, enclosingElement.getCompilationUnit());
 
   bool isConstructorName(Node nameNode) {
     if (enclosingElement === null ||