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

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

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <Foundation/Foundation.h>
 
 #include "base/format_macros.h"
-#include "base/mac/scoped_nsobject.h"
 #import "ios/chrome/browser/ui/toolbar/toolbar_controller.h"
 #import "ios/chrome/browser/ui/toolbar/toolbar_controller_private.h"
 #import "ios/chrome/browser/ui/ui_util.h"
 #include "testing/gtest_mac.h"
 #include "testing/platform_test.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // A constant holding some number of tabs that will trigger an easter egg.
 const NSInteger kStackButtonEasterEggTabCount = kStackButtonMaxTabCount + 1;
 
 // The easter egg string.
 NSString* kStackButtonEasterEggString = @":)";
 
 // Strings containing the max tab count and easter egg tab counts.
 NSString* kStackButtonMaxTabCountString =
     [NSString stringWithFormat:@"%" PRIdNS, kStackButtonMaxTabCount];
 NSString* kStackButtonEasterEggTabCountString =
     [NSString stringWithFormat:@"%" PRIdNS, kStackButtonEasterEggTabCount];
 
 #pragma mark -
 
 namespace {
 
 class ToolbarControllerTest : public PlatformTest {
  protected:
   void SetUp() override {
-    toolbarController_.reset([[ToolbarController alloc]
-        initWithStyle:ToolbarControllerStyleLightMode]);
+    PlatformTest::SetUp();
+    toolbarController_ = [[ToolbarController alloc]
+        initWithStyle:ToolbarControllerStyleLightMode];
   }
 
-  base::scoped_nsobject<ToolbarController> toolbarController_;
+  ToolbarController* toolbarController_;
 };
 
 // Verify that if tab count is set to zero, the title is blank, but the a11y
 // value is 0.
 //
 // Note that the iPad doesn't have a |stackButton|, but setTabCount may still
 // be invoked so this test covers that code path. The rest of the tab count
 // tests don't do anything if run on an iPad.
 TEST_F(ToolbarControllerTest, TestTabCountZero) {
   // On iPad, there is no |stackButton|, so the title should be NULL.
@@ skipping 33 matching lines @@
   [toolbarController_ setTabCount:kStackButtonEasterEggTabCount];
   EXPECT_NSEQ(kStackButtonEasterEggString,
               [toolbarController_ stackButton].currentTitle);
 
   [toolbarController_ setTabCount:kStackButtonMaxTabCount];
   EXPECT_NSEQ(kStackButtonMaxTabCountString,
               [toolbarController_ stackButton].currentTitle);
 }
 
 }  // namespace