Removed DARTIUM codegen for IDLS (sdk/lib/dartium)

tools/dom/templates/immutable_list_mixin.darttemplate

Index: tools/dom/templates/immutable_list_mixin.darttemplate
diff --git a/tools/dom/templates/immutable_list_mixin.darttemplate b/tools/dom/templates/immutable_list_mixin.darttemplate
index 02b0b4e0683e267de4a32e4d26317d35547b495e..68d938f006657ad63ab5d3b2a806fa8b6af3f985 100644
--- a/tools/dom/templates/immutable_list_mixin.darttemplate
+++ b/tools/dom/templates/immutable_list_mixin.darttemplate
@@ -14,14 +14,11 @@ $endif
 
   $E get first {
     if (this.length > 0) {
-$if DART2JS
       return JS('$EJS', '#[0]', this);
-$else
 $if USE_NATIVE_INDEXED_GETTER
       return $GETTER(0);
 $else
       return this[0];
-$endif
 $endif
     }
     throw new StateError("No elements");
@@ -30,14 +27,11 @@ $endif
   $E get last {
     int len = this.length;
     if (len > 0) {
-$if DART2JS
       return JS('$EJS', '#[#]', this, len - 1);
-$else
 $if USE_NATIVE_INDEXED_GETTER
       return $GETTER(len - 1);
 $else
       return this[len - 1];
-$endif
 $endif
     }
     throw new StateError("No elements");
@@ -46,14 +40,11 @@ $endif
   $E get single {
     int len = this.length;
     if (len == 1) {
-$if DART2JS
       return JS('$EJS', '#[0]', this);
-$else
 $if USE_NATIVE_INDEXED_GETTER
       return $GETTER(0);
 $else
       return this[0];
-$endif
 $endif
     }
     if (len == 0) throw new StateError("No elements");