Introduce App Launcher for Windows.

chrome/browser/ui/app_list/apps_model_builder.cc

Index: chrome/browser/ui/app_list/apps_model_builder.cc
diff --git a/chrome/browser/ui/app_list/apps_model_builder.cc b/chrome/browser/ui/app_list/apps_model_builder.cc
index 9448c0dea774dfbf6e3cc985805f708c885cc666..608968dcff820b789404118dba187fa11ece5870 100644
--- a/chrome/browser/ui/app_list/apps_model_builder.cc
+++ b/chrome/browser/ui/app_list/apps_model_builder.cc
@@ -19,6 +19,7 @@ using extensions::Extension;
 
 namespace {
 
+// TODO(benwells): Get the list of special apps from the controller.

[xiyuan, 2012/08/30 16:50:51]

Please hold off doing this or ping me before you start. I have a task to support
NTP ordering in app list and we might get rid of the special apps all together.

[benwells, 2012/09/04 04:47:59]

OK, I'll ping you before touching this.

 const char* kSpecialApps[] = {
   extension_misc::kChromeAppId,
   extension_misc::kWebStoreAppId,
@@ -154,7 +155,8 @@ void AppsModelBuilder::CreateSpecialApps() {
       continue;
 
     const Extension* extension = service->GetInstalledExtension(extension_id);
-    DCHECK(extension);
+    if (!extension)
+      continue;
 
     model_->Add(new ExtensionAppItem(profile_, extension, controller_));
   }