Make some updates to extension iconography.

chrome/browser/ui/webui/ntp/app_launcher_handler.cc

Index: chrome/browser/ui/webui/ntp/app_launcher_handler.cc
diff --git a/chrome/browser/ui/webui/ntp/app_launcher_handler.cc b/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
index 0e2b5bede13f0a449e4b3e963808aac13416d65c..42dd7b55402a79420098cded4c1b89ee92d74f9b 100644
--- a/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
+++ b/chrome/browser/ui/webui/ntp/app_launcher_handler.cc
@@ -160,25 +160,12 @@ void AppLauncherHandler::CreateAppInfo(
       service->profile())->management_policy()->UserMayModifySettings(
       extension, NULL));
 
-  bool icon_big_exists = true;
   // Instead of setting grayscale here, we do it in apps_page.js.
-  GURL icon_big = extensions::ExtensionIconSource::GetIconURL(
-      extension,
-      extension_misc::EXTENSION_ICON_LARGE,
-      ExtensionIconSet::MATCH_BIGGER,
-      false,
-      &icon_big_exists);
-  value->SetString("icon_big", icon_big.spec());
-  value->SetBoolean("icon_big_exists", icon_big_exists);
-  bool icon_small_exists = true;
-  GURL icon_small = extensions::ExtensionIconSource::GetIconURL(
-      extension,
-      extension_misc::EXTENSION_ICON_BITTY,
-      ExtensionIconSet::MATCH_BIGGER,
-      false,
-      &icon_small_exists);
-  value->SetString("icon_small", icon_small.spec());
-  value->SetBoolean("icon_small_exists", icon_small_exists);
+  GURL icon = extensions::ExtensionIconSource::GetIconURL(
+      extension, extension_misc::EXTENSION_ICON_LARGE,
+      ExtensionIconSet::MATCH_BIGGER, false);
+  DCHECK_NE(GURL(), icon);
+  value->SetString("icon", icon.spec());
   value->SetInteger("launch_container",
                     extensions::AppLaunchInfo::GetLaunchContainer(extension));
   ExtensionPrefs* prefs = ExtensionPrefs::Get(service->profile());