Revert "First step towards having patch files for generic libraries."

lib/compiler/implementation/scanner/listener.dart

Index: lib/compiler/implementation/scanner/listener.dart
diff --git a/lib/compiler/implementation/scanner/listener.dart b/lib/compiler/implementation/scanner/listener.dart
index 3437160e7305ae22686b41e0ad6bece8eb1ef394..6c9c41a652bbad603197f2a299f03e75e81de961 100644
--- a/lib/compiler/implementation/scanner/listener.dart
+++ b/lib/compiler/implementation/scanner/listener.dart
@@ -1486,10 +1486,6 @@ class PartialFunctionElement extends FunctionElement {
 
   FunctionExpression parseNode(DiagnosticListener listener) {
     if (cachedNode != null) return cachedNode;
-    if (patch !== null) {
-      cachedNode = patch.parseNode(listener);
-      return cachedNode;
-    }
     parseFunction(Parser p) {
       if (isMember() && p.optional('factory', beginToken)) {
         p.parseFactoryMethod(beginToken);
@@ -1501,10 +1497,7 @@ class PartialFunctionElement extends FunctionElement {
     return cachedNode;
   }
 
-  Token position() {
-    if (patch !== null) return patch.position();
-    return findMyName(beginToken);
-  }
+  Token position() => findMyName(beginToken);
 }
 
 class PartialFieldListElement extends VariableListElement {