Reverts the following two commits:

pkg/compiler/lib/src/resolution/signatures.dart

Index: pkg/compiler/lib/src/resolution/signatures.dart
diff --git a/pkg/compiler/lib/src/resolution/signatures.dart b/pkg/compiler/lib/src/resolution/signatures.dart
index 7fd39eea469fc8f423e5e8248e6e64fa467468ed..ae39454ca961667060499877c13bbffcf1d8e08f 100644
--- a/pkg/compiler/lib/src/resolution/signatures.dart
+++ b/pkg/compiler/lib/src/resolution/signatures.dart
@@ -94,9 +94,7 @@ class SignatureResolver extends MappingVisitor<FormalElementX> {
       reporter.internalError(node, 'function type parameters not supported');
     }
     currentDefinitions = node;
-    FormalElementX element = definition == null
-        ? createUnnamedParameter()  // This happens in function types.
-        : definition.accept(this);
+    FormalElementX element = definition.accept(this);
     if (currentDefinitions.metadata != null) {
       element.metadataInternal =
           resolution.resolver.resolveMetadata(element, node);
@@ -115,8 +113,7 @@ class SignatureResolver extends MappingVisitor<FormalElementX> {
 
   void computeParameterType(FormalElementX element,
       [VariableElement fieldElement]) {
-    // Function-type as in `foo(int bar(String x))`
-    void computeInlineFunctionType(FunctionExpression functionExpression) {
+    void computeFunctionType(FunctionExpression functionExpression) {
       FunctionSignature functionSignature = SignatureResolver.analyze(
           resolution,
           scope,
@@ -138,14 +135,13 @@ class SignatureResolver extends MappingVisitor<FormalElementX> {
       assert(invariant(currentDefinitions, link.tail.isEmpty));
       if (link.head.asFunctionExpression() != null) {
         // Inline function typed parameter, like `void m(int f(String s))`.
-        computeInlineFunctionType(link.head);
+        computeFunctionType(link.head);
       } else if (link.head.asSend() != null &&
           link.head.asSend().selector.asFunctionExpression() != null) {
         // Inline function typed initializing formal or
         // parameter with default value, like `C(int this.f(String s))` or
         // `void m([int f(String s) = null])`.
-        computeInlineFunctionType(
-            link.head.asSend().selector.asFunctionExpression());
+        computeFunctionType(link.head.asSend().selector.asFunctionExpression());
       } else {
         assert(invariant(currentDefinitions,
             link.head.asIdentifier() != null || link.head.asSend() != null));
@@ -202,15 +198,6 @@ class SignatureResolver extends MappingVisitor<FormalElementX> {
     return parameter;
   }
 
-  FormalElementX createUnnamedParameter() {
-    FormalElementX parameter;
-    assert(!createRealParameters);
-    parameter = new FormalElementX.unnamed(
-          ElementKind.PARAMETER, enclosingElement, currentDefinitions);
-    computeParameterType(parameter);
-    return parameter;
-  }
-
   InitializingFormalElementX createFieldParameter(
       Send node, Expression initializer) {
     InitializingFormalElementX element;
@@ -434,7 +421,7 @@ class SignatureResolver extends MappingVisitor<FormalElementX> {
     List<Element> orderedOptionalParameters =
         visitor.optionalParameters.toList();
     if (visitor.optionalParametersAreNamed) {
-      // TODO(karlklose); replace when [visitor.optionalParameters] is a [List].
+      // TODO(karlklose); replace when [visitor.optinalParameters] is a [List].
       orderedOptionalParameters.sort((Element a, Element b) {
         return a.name.compareTo(b.name);
       });
@@ -449,7 +436,7 @@ class SignatureResolver extends MappingVisitor<FormalElementX> {
       namedParameterTypes =
           namedParameterTypesBuilder.toLink().toList(growable: false);
     } else {
-      // TODO(karlklose); replace when [visitor.optionalParameters] is a [List].
+      // TODO(karlklose); replace when [visitor.optinalParameters] is a [List].
       LinkBuilder<ResolutionDartType> optionalParameterTypesBuilder =
           new LinkBuilder<ResolutionDartType>();
       for (FormalElement parameter in visitor.optionalParameters) {