Make isEmpty a getter.

lib/compiler/implementation/scanner/parser.dart

Index: lib/compiler/implementation/scanner/parser.dart
diff --git a/lib/compiler/implementation/scanner/parser.dart b/lib/compiler/implementation/scanner/parser.dart
index 47d8c61b5aa04f31a32f8ed8250fc7587eb046c8..14ad03b2e9f843dda011a5bb1486cf1f09784c4e 100644
--- a/lib/compiler/implementation/scanner/parser.dart
+++ b/lib/compiler/implementation/scanner/parser.dart
@@ -573,13 +573,13 @@ class Parser {
     listener.beginTopLevelMember(token);
 
     Link<Token> identifiers = findMemberName(token);
-    if (identifiers.isEmpty()) {
+    if (identifiers.isEmpty) {
       return listener.unexpected(start);
     }
     Token name = identifiers.head;
     identifiers = identifiers.tail;
     Token getOrSet;
-    if (!identifiers.isEmpty()) {
+    if (!identifiers.isEmpty) {
       String value = identifiers.head.stringValue;
       if ((identical(value, 'get')) || (identical(value, 'set'))) {
         getOrSet = identifiers.head;
@@ -587,7 +587,7 @@ class Parser {
       }
     }
     Token type;
-    if (!identifiers.isEmpty()) {
+    if (!identifiers.isEmpty) {
       if (isValidTypeReference(identifiers.head)) {
         type = identifiers.head;
         identifiers = identifiers.tail;
@@ -771,7 +771,7 @@ class Parser {
 
   void parseModifierList(Link<Token> tokens) {
     int count = 0;
-    for (; !tokens.isEmpty(); tokens = tokens.tail) {
+    for (; !tokens.isEmpty; tokens = tokens.tail) {
       Token token = tokens.head;
       if (isModifier(token)) {
         parseModifier(token);
@@ -867,26 +867,26 @@ class Parser {
     listener.beginMember(token);
 
     Link<Token> identifiers = findMemberName(token);
-    if (identifiers.isEmpty()) {
+    if (identifiers.isEmpty) {
       return listener.unexpected(start);
     }
     Token name = identifiers.head;
     identifiers = identifiers.tail;
-    if (!identifiers.isEmpty()) {
+    if (!identifiers.isEmpty) {
       if (optional('operator', identifiers.head)) {
         name = identifiers.head;
         identifiers = identifiers.tail;
       }
     }
     Token getOrSet;
-    if (!identifiers.isEmpty()) {
+    if (!identifiers.isEmpty) {
       if (isGetOrSet(identifiers.head)) {
         getOrSet = identifiers.head;
         identifiers = identifiers.tail;
       }
     }
     Token type;
-    if (!identifiers.isEmpty()) {
+    if (!identifiers.isEmpty) {
       if (isValidTypeReference(identifiers.head)) {
         type = identifiers.head;
         identifiers = identifiers.tail;