Revert "Change signature of noSuchMethod to take an InvocationMirror."

tests/compiler/dart2js/mock_compiler.dart

Index: tests/compiler/dart2js/mock_compiler.dart
diff --git a/tests/compiler/dart2js/mock_compiler.dart b/tests/compiler/dart2js/mock_compiler.dart
index 50bb4311ffb010d1fb43ae410d08c553445ae933..0a26a094d6569d97dc3205c59351367625be712e 100644
--- a/tests/compiler/dart2js/mock_compiler.dart
+++ b/tests/compiler/dart2js/mock_compiler.dart
@@ -42,7 +42,6 @@ const String DEFAULT_HELPERLIB = r'''
   stringTypeCheck(x) {}
   boolConversionCheck(x) {}
   abstract class JavaScriptIndexingBehavior {}
-  class JSInvocationMirror {}
   S() {}
   assertHelper(a){}''';
 
@@ -93,7 +92,6 @@ class MockCompiler extends Compiler {
     // We need to set the assert method to avoid calls with a 'null'
     // target being interpreted as a call to assert.
     jsHelperLibrary = createLibrary("helper", helperSource);
-    importHelperLibrary(coreLibrary);
     assertMethod = jsHelperLibrary.find(buildSourceString('assert'));
     interceptorsLibrary = createLibrary("interceptors", interceptorsSource);