Use signature inheritance when method types are unchanged

lib/runtime/dart/_interceptors.js

 var _interceptors = dart.defineLibrary(_interceptors, {});
 var core = dart.import(core);
 var _js_helper = dart.lazyImport(_js_helper);
 var _internal = dart.import(_internal);
 var _foreign_helper = dart.import(_foreign_helper);
 var _js_embedded_names = dart.import(_js_embedded_names);
 (function(exports, core, _js_helper, _internal, _foreign_helper, _js_embedded_names) {
   'use strict';
   let JSArray = Array;
   let JSMutableArray$ = dart.generic(function(E) {
@@ skipping 32 matching lines @@
       return _js_helper.Primitives.objectToString(this);
     }
     noSuchMethod(invocation) {
       throw new core.NoSuchMethodError(this, invocation.memberName, invocation.positionalArguments, invocation.namedArguments);
     }
     get runtimeType() {
       return _js_helper.getRuntimeType(this);
     }
   }
   dart.setSignature(Interceptor, {
-    methods: () => ({
-      '==': dart.functionType(core.bool, [core.Object]),
-      toString: dart.functionType(core.String, []),
-      noSuchMethod: dart.functionType(dart.dynamic, [core.Invocation])
-    })
+    methods: () => ({'==': dart.functionType(core.bool, [core.Object])})
   });
   let _isInt32 = Symbol('_isInt32');
   let _tdivFast = Symbol('_tdivFast');
   let _tdivSlow = Symbol('_tdivSlow');
   let _shlPositive = Symbol('_shlPositive');
   let _shrReceiverPositive = Symbol('_shrReceiverPositive');
   let _shrOtherPositive = Symbol('_shrOtherPositive');
   let _shrBothPositive = Symbol('_shrBothPositive');
   class JSNumber extends Interceptor {
     JSNumber() {
@@ skipping 314 matching lines @@
       ceilToDouble: dart.functionType(core.double, []),
       floorToDouble: dart.functionType(core.double, []),
       roundToDouble: dart.functionType(core.double, []),
       truncateToDouble: dart.functionType(core.double, []),
       clamp: dart.functionType(core.num, [core.num, core.num]),
       toDouble: dart.functionType(core.double, []),
       toStringAsFixed: dart.functionType(core.String, [core.int]),
       toStringAsExponential: dart.functionType(core.String, [], [core.int]),
       toStringAsPrecision: dart.functionType(core.String, [core.int]),
       toRadixString: dart.functionType(core.String, [core.int]),
-      toString: dart.functionType(core.String, []),
       'unary-': dart.functionType(core.num, []),
       '+': dart.functionType(core.num, [core.num]),
       '-': dart.functionType(core.num, [core.num]),
       '/': dart.functionType(core.double, [core.num]),
       '*': dart.functionType(core.num, [core.num]),
       '%': dart.functionType(core.num, [core.num]),
       [_isInt32]: dart.functionType(core.bool, [dart.dynamic]),
       '~/': dart.functionType(core.int, [core.num]),
       [_tdivFast]: dart.functionType(core.int, [core.num]),
       [_tdivSlow]: dart.functionType(core.int, [core.num]),
@@ skipping 548 matching lines @@
       trim: dart.functionType(core.String, []),
       trimLeft: dart.functionType(core.String, []),
       trimRight: dart.functionType(core.String, []),
       '*': dart.functionType(core.String, [core.int]),
       padLeft: dart.functionType(core.String, [core.int], [core.String]),
       padRight: dart.functionType(core.String, [core.int], [core.String]),
       indexOf: dart.functionType(core.int, [core.Pattern], [core.int]),
       lastIndexOf: dart.functionType(core.int, [core.Pattern], [core.int]),
       contains: dart.functionType(core.bool, [core.Pattern], [core.int]),
       compareTo: dart.functionType(core.int, [core.String]),
-      toString: dart.functionType(core.String, []),
       get: dart.functionType(core.String, [core.int])
     }),
     statics: () => ({
       _isWhitespace: dart.functionType(core.bool, [core.int]),
       _skipLeadingWhitespace: dart.functionType(core.int, [core.String, core.int]),
       _skipTrailingWhitespace: dart.functionType(core.int, [core.String, core.int])
     }),
     names: ['_isWhitespace', '_skipLeadingWhitespace', '_skipTrailingWhitespace']
   });
   let _string = Symbol('_string');
@@ skipping 143 matching lines @@
       return String(this);
     }
     get hashCode() {
       return this ? 2 * 3 * 23 * 3761 : 269 * 811;
     }
     get runtimeType() {
       return core.bool;
     }
   }
   JSBool[dart.implements] = () => [core.bool];
-  dart.setSignature(JSBool, {
-    methods: () => ({toString: dart.functionType(core.String, [])})
-  });
+  dart.setSignature(JSBool, {});
   class JSNull extends Interceptor {
     JSNull() {
       super.Interceptor();
     }
     ['=='](other) {
       return core.identical(null, other);
     }
     toString() {
       return 'null';
     }
     get hashCode() {
       return 0;
     }
     get runtimeType() {
       return core.Null;
     }
     noSuchMethod(invocation) {
       return super.noSuchMethod(invocation);
     }
   }
   JSNull[dart.implements] = () => [core.Null];
   dart.setSignature(JSNull, {
-    methods: () => ({
-      '==': dart.functionType(core.bool, [dart.dynamic]),
-      toString: dart.functionType(core.String, []),
-      noSuchMethod: dart.functionType(dart.dynamic, [core.Invocation])
-    })
+    methods: () => ({'==': dart.functionType(core.bool, [dart.dynamic])})
   });
   class JSIndexable extends core.Object {}
   dart.setSignature(JSIndexable, {});
   class JSMutableIndexable extends JSIndexable {}
   dart.setSignature(JSMutableIndexable, {});
   class JSObject extends core.Object {}
   dart.setSignature(JSObject, {});
   class JavaScriptObject extends Interceptor {
     JavaScriptObject() {
       super.Interceptor();
@@ skipping 14 matching lines @@
   }
   dart.setSignature(PlainJavaScriptObject, {});
   class UnknownJavaScriptObject extends JavaScriptObject {
     UnknownJavaScriptObject() {
       super.JavaScriptObject();
     }
     toString() {
       return String(this);
     }
   }
-  dart.setSignature(UnknownJavaScriptObject, {
-    methods: () => ({toString: dart.functionType(core.String, [])})
-  });
+  dart.setSignature(UnknownJavaScriptObject, {});
   // Exports:
   exports.JSArray = JSArray;
   exports.JSMutableArray$ = JSMutableArray$;
   exports.JSMutableArray = JSMutableArray;
   exports.JSFixedArray$ = JSFixedArray$;
   exports.JSFixedArray = JSFixedArray;
   exports.JSExtendableArray$ = JSExtendableArray$;
   exports.JSExtendableArray = JSExtendableArray;
   exports.Interceptor = Interceptor;
   exports.JSNumber = JSNumber;
@@ skipping 18 matching lines @@
   exports.findInterceptorForType = findInterceptorForType;
   exports.JSBool = JSBool;
   exports.JSNull = JSNull;
   exports.JSIndexable = JSIndexable;
   exports.JSMutableIndexable = JSMutableIndexable;
   exports.JSObject = JSObject;
   exports.JavaScriptObject = JavaScriptObject;
   exports.PlainJavaScriptObject = PlainJavaScriptObject;
   exports.UnknownJavaScriptObject = UnknownJavaScriptObject;
 })(_interceptors, core, _js_helper, _internal, _foreign_helper, _js_embedded_names);