[ObjC ARC] Converts ios/chrome/browser/ui/toolbar:test_support to ARC.

ios/chrome/browser/ui/toolbar/test_toolbar_model_ios.mm

Index: ios/chrome/browser/ui/toolbar/test_toolbar_model_ios.mm
diff --git a/ios/chrome/browser/ui/toolbar/test_toolbar_model_ios.mm b/ios/chrome/browser/ui/toolbar/test_toolbar_model_ios.mm
index 11736d37553806bc20fd3f101f0a8d3d7c64c711..da4c58f3f97670209735b6275e8f1dae2129692a 100644
--- a/ios/chrome/browser/ui/toolbar/test_toolbar_model_ios.mm
+++ b/ios/chrome/browser/ui/toolbar/test_toolbar_model_ios.mm
@@ -7,14 +7,18 @@
 #include "components/toolbar/toolbar_model_impl.h"
 #import "ios/chrome/browser/tabs/tab.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 TestToolbarModelIOS::TestToolbarModelIOS()
     : ToolbarModelIOS(),
-      is_loading_(FALSE),
+      is_loading_(false),
       load_progress_fraction_(0.0),
-      can_go_back_(FALSE),
-      can_go_forward_(FALSE),
-      is_current_tab_native_page_(FALSE),
-      is_current_tab_bookmarked_(FALSE) {
+      can_go_back_(false),
+      can_go_forward_(false),
+      is_current_tab_native_page_(false),
+      is_current_tab_bookmarked_(false) {
   test_toolbar_model_.reset(new TestToolbarModel());
 }