Use signature inheritance when method types are unchanged

lib/runtime/dart/_internal.js

Index: lib/runtime/dart/_internal.js
diff --git a/lib/runtime/dart/_internal.js b/lib/runtime/dart/_internal.js
index d2e2a9b939d902d672c0f3d80a11fcc7657e0a32..f1bda6fa7dc3b0a8f712027579397202e7a3232d 100644
--- a/lib/runtime/dart/_internal.js
+++ b/lib/runtime/dart/_internal.js
@@ -242,13 +242,11 @@ var _js_primitives = dart.lazyImport(_js_primitives);
     dart.setSignature(ListIterable, {
       methods: () => ({
         [core.$forEach]: dart.functionType(dart.void, [dart.functionType(dart.void, [E])]),
-        [core.$contains]: dart.functionType(core.bool, [core.Object]),
         [core.$every]: dart.functionType(core.bool, [dart.functionType(core.bool, [E])]),
         [core.$any]: dart.functionType(core.bool, [dart.functionType(core.bool, [E])]),
         [core.$firstWhere]: dart.functionType(E, [dart.functionType(core.bool, [E])], {rEls: dart.functionType(E, [])}),
         [core.$lastWhere]: dart.functionType(E, [dart.functionType(core.bool, [E])], {rEls: dart.functionType(E, [])}),
         [core.$singleWhere]: dart.functionType(E, [dart.functionType(core.bool, [E])]),
-        [core.$join]: dart.functionType(core.String, [], [core.String]),
         [core.$where]: dart.functionType(core.Iterable$(E), [dart.functionType(core.bool, [E])]),
         [core.$map]: dart.functionType(core.Iterable, [dart.functionType(dart.dynamic, [E])]),
         [core.$reduce]: dart.functionType(E, [dart.functionType(E, [dart.dynamic, E])]),
@@ -958,13 +956,11 @@ var _js_primitives = dart.lazyImport(_js_primitives);
       methods: () => ({
         [core.$forEach]: dart.functionType(dart.void, [dart.functionType(dart.void, [E])]),
         [core.$elementAt]: dart.functionType(E, [core.int]),
-        [core.$contains]: dart.functionType(core.bool, [core.Object]),
         [core.$every]: dart.functionType(core.bool, [dart.functionType(core.bool, [E])]),
         [core.$any]: dart.functionType(core.bool, [dart.functionType(core.bool, [E])]),
         [core.$firstWhere]: dart.functionType(E, [dart.functionType(core.bool, [E])], {rEls: dart.functionType(E, [])}),
         [core.$lastWhere]: dart.functionType(E, [dart.functionType(core.bool, [E])], {rEls: dart.functionType(E, [])}),
         [core.$singleWhere]: dart.functionType(E, [dart.functionType(core.bool, [E])], {rEls: dart.functionType(E, [])}),
-        [core.$join]: dart.functionType(core.String, [], [core.String]),
         [core.$where]: dart.functionType(core.Iterable$(E), [dart.functionType(core.bool, [E])]),
         [core.$map]: dart.functionType(core.Iterable, [dart.functionType(dart.dynamic, [E])]),
         [core.$reduce]: dart.functionType(E, [dart.functionType(E, [E, E])]),
@@ -1752,8 +1748,7 @@ var _js_primitives = dart.lazyImport(_js_primitives);
         putIfAbsent: dart.functionType(E, [core.int, dart.functionType(E, [])]),
         remove: dart.functionType(E, [core.Object]),
         clear: dart.functionType(dart.void, []),
-        addAll: dart.functionType(dart.void, [core.Map$(core.int, E)]),
-        toString: dart.functionType(core.String, [])
+        addAll: dart.functionType(dart.void, [core.Map$(core.int, E)])
       })
     });
     return ListMapView;
@@ -2216,10 +2211,7 @@ var _js_primitives = dart.lazyImport(_js_primitives);
   dart.defineNamedConstructor(Symbol, 'unvalidated');
   dart.defineNamedConstructor(Symbol, 'validated');
   dart.setSignature(Symbol, {
-    methods: () => ({
-      '==': dart.functionType(core.bool, [core.Object]),
-      toString: dart.functionType(core.String, [])
-    }),
+    methods: () => ({'==': dart.functionType(core.bool, [core.Object])}),
     statics: () => ({
       getName: dart.functionType(core.String, [Symbol]),
       validatePublicSymbol: dart.functionType(core.String, [core.String]),