diff --git a/Chapter_02/web/main.dart b/Chapter_02/web/main.dart
index a8e22f9..48abb8b 100644
--- a/Chapter_02/web/main.dart
+++ b/Chapter_02/web/main.dart
@@ -1,7 +1,6 @@
 library recipe_book;
 
 import 'package:angular/angular.dart';
-import 'package:perf_api/perf_api.dart';
 
 // Temporary, please follow https://github.com/angular/angular.dart/issues/476
 @MirrorsUsed(targets: const['recipe_book'], override: '*')
@@ -78,7 +77,6 @@ class Recipe {
 class MyAppModule extends Module {
   MyAppModule() {
     type(RecipeBookController);
-    type(Profiler, implementedBy: Profiler); // comment out to enable profiling
   }
 }
 
diff --git a/Chapter_03/web/main.dart b/Chapter_03/web/main.dart
index 8043ad8..9fd0b6f 100644
--- a/Chapter_03/web/main.dart
+++ b/Chapter_03/web/main.dart
@@ -2,7 +2,6 @@ library recipe_book;
 
 import 'package:angular/angular.dart';
 import 'package:di/di.dart';
-import 'package:perf_api/perf_api.dart';
 
 import 'package:angular_dart_demo/rating/rating_component.dart';
 import 'package:angular_dart_demo/recipe_book.dart';
@@ -15,7 +14,6 @@ class MyAppModule extends Module {
   MyAppModule() {
     type(RecipeBookController);
     type(RatingComponent);
-    type(Profiler, implementedBy: Profiler); // comment out to enable profiling
   }
 }
 
diff --git a/Chapter_04/web/main.dart b/Chapter_04/web/main.dart
index 59dfb75..2b06e71 100644
--- a/Chapter_04/web/main.dart
+++ b/Chapter_04/web/main.dart
@@ -2,7 +2,6 @@ library recipe_book;
 
 import 'package:angular/angular.dart';
 import 'package:di/di.dart';
-import 'package:perf_api/perf_api.dart';
 
 import 'package:angular_dart_demo/recipe_book.dart';
 import 'package:angular_dart_demo/rating/rating_component.dart';
@@ -19,7 +18,6 @@ class MyAppModule extends Module {
     type(RecipeBookController);
     type(RatingComponent);
     type(Tooltip);
-    type(Profiler, implementedBy: Profiler); // comment out to enable profiling
   }
 }
 
diff --git a/Chapter_05/web/main.dart b/Chapter_05/web/main.dart
index 0470c87..4cb0b48 100644
--- a/Chapter_05/web/main.dart
+++ b/Chapter_05/web/main.dart
@@ -2,7 +2,6 @@ library recipe_book;
 
 import 'package:angular/angular.dart';
 import 'package:di/di.dart';
-import 'package:perf_api/perf_api.dart';
 
 import 'package:angular_dart_demo/recipe_book.dart';
 import 'package:angular_dart_demo/filter/category_filter.dart';
@@ -21,7 +20,6 @@ class MyAppModule extends Module {
     type(RatingComponent);
     type(Tooltip);
     type(CategoryFilter);
-    type(Profiler, implementedBy: Profiler); // comment out to enable profiling
   }
 }
 
diff --git a/Chapter_06/web/main.dart b/Chapter_06/web/main.dart
index 84254a6..ee546d8 100644
--- a/Chapter_06/web/main.dart
+++ b/Chapter_06/web/main.dart
@@ -5,7 +5,6 @@ import 'package:angular/angular.dart';
 import 'package:angular/routing/module.dart';
 import 'package:di/di.dart';
 import 'package:logging/logging.dart';
-import 'package:perf_api/perf_api.dart';
 
 import 'package:angular_dart_demo/recipe_book.dart';
 import 'package:angular_dart_demo/filter/category_filter.dart';
@@ -28,7 +27,6 @@ class MyAppModule extends Module {
     type(RatingComponent);
     type(Tooltip);
     type(CategoryFilter);
-    type(Profiler, implementedBy: Profiler); // comment out to enable profiling
     type(SearchRecipeComponent);
     type(ViewRecipeComponent);
     type(QueryService);
diff --git a/Chapter_07/web/main.dart b/Chapter_07/web/main.dart
index af8c947..784e2dd 100644
--- a/Chapter_07/web/main.dart
+++ b/Chapter_07/web/main.dart
@@ -1,7 +1,3 @@
-// Used by di codegen to identify instantiable types.
-@Injectables(const [
-    Profiler
-])
 library recipe_book;
 
 // Temporary, please follow https://github.com/angular/angular.dart/issues/476
@@ -16,7 +12,6 @@ import 'package:angular/routing/module.dart';
 import 'package:di/di.dart';
 import 'package:di/annotations.dart';
 import 'package:logging/logging.dart';
-import 'package:perf_api/perf_api.dart';
 
 import 'package:angular_dart_demo/recipe_book.dart';
 import 'package:angular_dart_demo/filter/category_filter.dart';
@@ -40,7 +35,6 @@ class MyAppModule extends Module {
     type(RatingComponent);
     type(Tooltip);
     type(CategoryFilter);
-    type(Profiler, implementedBy: Profiler); // comment out to enable profiling
     type(SearchRecipeComponent);
     type(ViewRecipeComponent);
     type(QueryService);