Use entities in CommonElements interface.

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index 2033f8271b39186646435ec2b7acf465c7f062e9..795b81c55e805af8bd51ca2abc9fbc968b77dd9d 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -1170,8 +1170,8 @@ class _CompilerCommonElements implements CommonElements {
   ClassElement get functionClass =>
       _functionClass ??= _findRequired(coreLibrary, 'Function');
 
-  Element _functionApplyMethod;
-  Element get functionApplyMethod {
+  MethodElement _functionApplyMethod;
+  MethodElement get functionApplyMethod {
     if (_functionApplyMethod == null) {
       functionClass.ensureResolved(resolution);
       _functionApplyMethod = functionClass.lookupLocalMember('apply');
@@ -1181,7 +1181,7 @@ class _CompilerCommonElements implements CommonElements {
     return _functionApplyMethod;
   }
 
-  bool isFunctionApplyMethod(Element element) =>
+  bool isFunctionApplyMethod(MemberElement element) =>
       element.name == 'apply' && element.enclosingClass == functionClass;
 
   ClassElement _nullClass;
@@ -1229,8 +1229,8 @@ class _CompilerCommonElements implements CommonElements {
   ClassElement get resourceClass =>
       _resourceClass ??= _findRequired(coreLibrary, 'Resource');
 
-  Element _identicalFunction;
-  Element get identicalFunction =>
+  MethodElement _identicalFunction;
+  MethodElement get identicalFunction =>
       _identicalFunction ??= coreLibrary.find('identical');
 
   // From dart:async
@@ -1254,7 +1254,7 @@ class _CompilerCommonElements implements CommonElements {
       _mirrorSystemClass ??= _findRequired(mirrorsLibrary, 'MirrorSystem');
 
   FunctionElement _mirrorSystemGetNameFunction;
-  bool isMirrorSystemGetNameFunction(Element element) {
+  bool isMirrorSystemGetNameFunction(MemberElement element) {
     if (_mirrorSystemGetNameFunction == null) {
       if (!element.isFunction || mirrorsLibrary == null) return false;
       ClassElement cls = mirrorSystemClass;
@@ -1479,15 +1479,15 @@ class _CompilerCommonElements implements CommonElements {
 
   // TODO(johnniwinther): Change types to `ClassElement` when these are not
   // called with unrelated elements.
-  bool isNumberOrStringSupertype(/*Class*/ Element element) {
+  bool isNumberOrStringSupertype(/*Class*/ Entity element) {
     return element == coreLibrary.find('Comparable');
   }
 
-  bool isStringOnlySupertype(/*Class*/ Element element) {
+  bool isStringOnlySupertype(/*Class*/ Entity element) {
     return element == coreLibrary.find('Pattern');
   }
 
-  bool isListSupertype(/*Class*/ Element element) => element == iterableClass;
+  bool isListSupertype(/*Class*/ Entity element) => element == iterableClass;
 }
 
 class CompilerDiagnosticReporter extends DiagnosticReporter {