Migrate error messages, part 2.

src/generator.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 "use strict";
 
 // This file relies on the fact that the following declarations have been made
 // in runtime.js:
 // var $Function = global.Function;
 
 // ----------------------------------------------------------------------------
 
 
 // Generator functions and objects are specified by ES6, sections 15.19.3 and
 // 15.19.4.
 
 function GeneratorObjectNext(value) {
   if (!IS_GENERATOR(this)) {
-    throw MakeTypeError('incompatible_method_receiver',
-                        ['[Generator].prototype.next', this]);
+    throw MakeTypeError(kIncompatibleMethodReceiver,
+                        '[Generator].prototype.next', this);
   }
 
   var continuation = %GeneratorGetContinuation(this);
   if (continuation > 0) {
     // Generator is suspended.
     if (DEBUG_IS_ACTIVE) %DebugPrepareStepInIfStepping(this);
     try {
       return %_GeneratorNext(this, value);
     } catch (e) {
       %GeneratorClose(this);
       throw e;
     }
   } else if (continuation == 0) {
     // Generator is already closed.
     return { value: void 0, done: true };
   } else {
     // Generator is running.
-    throw MakeTypeError('generator_running', []);
+    throw MakeTypeError(kGeneratorRunning);
   }
 }
 
 function GeneratorObjectThrow(exn) {
   if (!IS_GENERATOR(this)) {
-    throw MakeTypeError('incompatible_method_receiver',
-                        ['[Generator].prototype.throw', this]);
+    throw MakeTypeError(kIncompatibleMethodReceiver,
+                        '[Generator].prototype.throw', this);
   }
 
   var continuation = %GeneratorGetContinuation(this);
   if (continuation > 0) {
     // Generator is suspended.
     try {
       return %_GeneratorThrow(this, exn);
     } catch (e) {
       %GeneratorClose(this);
       throw e;
     }
   } else if (continuation == 0) {
     // Generator is already closed.
     throw exn;
   } else {
     // Generator is running.
-    throw MakeTypeError('generator_running', []);
+    throw MakeTypeError(kGeneratorRunning);
   }
 }
 
 function GeneratorObjectIterator() {
   return this;
 }
 
 function GeneratorFunctionConstructor(arg1) {  // length == 1
   var source = NewFunctionString(arguments, 'function*');
   var global_proxy = %GlobalProxy(global);
@@ skipping 30 matching lines @@
   %InternalSetPrototype(GeneratorFunctionPrototype, $Function.prototype);
   %AddNamedProperty(GeneratorFunctionPrototype,
       symbolToStringTag, "GeneratorFunction", DONT_ENUM | READ_ONLY);
   %AddNamedProperty(GeneratorFunctionPrototype, "constructor",
       GeneratorFunction, DONT_ENUM | READ_ONLY);
   %InternalSetPrototype(GeneratorFunction, $Function);
   %SetCode(GeneratorFunction, GeneratorFunctionConstructor);
 }
 
 SetUpGenerators();