Fix interpolation unparse.

tests/compiler/dart2js/unparser_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #import('dart:uri');
 #import('parser_helper.dart');
 #import("../../../lib/compiler/compiler.dart");
 #import("../../../lib/compiler/implementation/tree/tree.dart");
 
 testUnparse(String statement) {
@@ skipping 95 matching lines @@
 testEmptyList() {
   testUnparse('var x= [];');
 }
 
 testClosure() {
   testUnparse('var x=(var x)=> x;');
 }
 
 testIndexedOperatorDecl() {
   testUnparseMember('operator[](int i)=> null;');
-  testUnparseMember('operator[]=(int i, int j)=> null;');
+  testUnparseMember('operator[]=(int i,int j)=> null;');
 }
 
 testNativeMethods() {
   testUnparseMember('foo()native;');
   testUnparseMember('foo()native "bar";');
   testUnparseMember('foo()native "this.x = 41";');
 }
 
 testPrefixIncrements() {
   testUnparse('++i;');
   testUnparse('++a[i];');
   testUnparse('++a[++b[i]];');
 }
 
 testConstModifier() {
   testUnparse('foo([var a=const []]){}');
   testUnparse('foo([var a=const{}]){}');
   testUnparse('foo(){var a=const []; var b=const{};}');
-  testUnparse('foo([var a=const [const{"a": const [1, 2, 3]}]]){}');
+  testUnparse('foo([var a=const [const{"a": const [1,2,3]}]]){}');
 }
 
 testSimpleFileUnparse() {
   final src = '''
 should_be_dropped() {
 }
 
 should_be_kept() {
 }
 
@@ skipping 25 matching lines @@
 testClassWithMethod() {
   testDart2Dart('main(){var a=new A(); a.foo();}class A{void foo(){}}');
 }
 
 testExtendsImplements() {
   testDart2Dart('main(){new B<Object>();}'
       'class A<T>{}class B<T> extends A<T>{}');
 }
 
 testVariableDefinitions() {
-  testDart2Dart('main(){final var x, y; final String s;}');
-  testDart2Dart('foo(f, g){}main(){foo(1, 2);}');
+  testDart2Dart('main(){final var x,y; final String s;}');
+  testDart2Dart('foo(f,g){}main(){foo(1,2);}');
   testDart2Dart('foo(f(arg)){}main(){foo(main);}');
   // A couple of static/finals inside a class.
   testDart2Dart('main(){A.a; A.b;}class A{static final String a="5";'
       'static final String b="4";}');
   // Class member of typedef-ed function type.
   // Maybe typedef should be included in the result too, but it
   // works fine without it.
   testDart2Dart('typedef void foofunc(arg);'
       'class A {'
         'final foofunc handler;'
@@ skipping 232 matching lines @@
   testGetSet();
   testFactoryConstructor();
   testTopLevelField();
   testAbstractClass();
   testConflictLibraryClassRename();
   testNoConflictSendsRename();
   testConflictSendsRename();
   testDefaultClassWithArgs();
   testClassExtendsWithArgs();
 }