Remove cancel and make crash exit with code 253.

sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart

Index: sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart b/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
index 4cb149edd7b8f95897d4e1cb451f6d08157639f5..2f9f0145cab39c65c88f78db5cbe64ad7e36bc14 100644
--- a/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_emitter/code_emitter_task.dart
@@ -742,8 +742,8 @@ class CodeEmitterTask extends CompilerTask {
       if (cls.isUnnamedMixinApplication) return null;
       return cls.name;
     }
-    throw compiler.internalErrorOnElement(
-        element, 'Do not know how to reflect on this $element');
+    throw compiler.internalError(element,
+        'Do not know how to reflect on this $element.');
   }
 
   String namedParametersAsReflectionNames(Selector selector) {
@@ -1421,7 +1421,8 @@ mainBuffer.add(r'''
           elementDescriptors[library] = const {};
         }
         if (!pendingStatics.isEmpty) {
-          compiler.internalError('Pending statics (see above).');
+          compiler.internalError(pendingStatics.first,
+              'Pending statics (see above).');
         }
         mainBuffer.write('])$N');
 
@@ -1600,7 +1601,7 @@ if (typeof $printHelperName === "function") {
       }
     }
     if (owner == null) {
-      compiler.internalErrorOnElement(element, 'Owner is null');
+      compiler.internalError(element, 'Owner is null.');
     }
     return getElementDescriptorForOutputUnit(owner,
         compiler.deferredLoadTask.outputUnitForElement(element));