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

ios/chrome/browser/ui/infobars/infobar_view_unittest.mm

 // Copyright 2013 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 "ios/chrome/browser/ui/infobars/infobar_view.h"
 
 #include "testing/gtest/include/gtest/gtest.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
+
 @interface InfoBarView (Testing)
 - (CGFloat)buttonsHeight;
 - (CGFloat)buttonMargin;
 - (CGFloat)computeRequiredHeightAndLayoutSubviews:(BOOL)layout;
 - (CGFloat)heightThatFitsButtonsUnderOtherWidgets:(CGFloat)heightOfFirstLine
                                            layout:(BOOL)layout;
 - (CGFloat)minimumInfobarHeight;
 - (NSString*)stripMarkersFromString:(NSString*)string;
 - (const std::vector<std::pair<NSUInteger, NSRange>>&)linkRanges;
 @end
 
 namespace {
 
 const int kShortStringLength = 4;
 const int kLongStringLength = 1000;
 
 class InfoBarViewTest : public PlatformTest {
  protected:
   void SetUp() override {
     PlatformTest::SetUp();
     CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width;
-    infobarView_.reset([[InfoBarView alloc]
-        initWithFrame:CGRectMake(0, 0, screenWidth, 0)
-             delegate:NULL]);
+    infobarView_ =
+        [[InfoBarView alloc] initWithFrame:CGRectMake(0, 0, screenWidth, 0)
+                                  delegate:NULL];
     [infobarView_ addCloseButtonWithTag:0 target:nil action:nil];
   }
 
   NSString* RandomString(int numberOfCharacters) {
     NSMutableString* string = [NSMutableString string];
     NSString* letters = @"abcde ";
     for (int i = 0; i < numberOfCharacters; i++) {
       [string
           appendFormat:@"%C", [letters characterAtIndex:arc4random_uniform(
                                                             [letters length])]];
@@ skipping 23 matching lines @@
     EXPECT_NSEQ(expectedOutput, output);
     const std::vector<std::pair<NSUInteger, NSRange>>& ranges =
         [infobarView_ linkRanges];
     EXPECT_EQ(expectedRanges.size(), ranges.size());
     for (unsigned int i = 0; i < expectedRanges.size(); ++i) {
       EXPECT_EQ(expectedRanges[i].first, ranges[i].first);
       EXPECT_TRUE(NSEqualRanges(expectedRanges[i].second, ranges[i].second));
     }
   }
 
-  base::scoped_nsobject<InfoBarView> infobarView_;
+  InfoBarView* infobarView_;
 };
 
 TEST_F(InfoBarViewTest, TestLayoutWithNoLabel) {
   // Do not call -addLabel: to test the case when there is no label.
   EXPECT_EQ(MinimumInfobarHeight(), InfobarHeight());
 }
 
 TEST_F(InfoBarViewTest, TestLayoutWithShortLabel) {
   [infobarView_ addLabel:ShortRandomString()];
   EXPECT_EQ(MinimumInfobarHeight(), InfobarHeight());
@@ skipping 82 matching lines @@
   // Multiple links and text.
   NSString* link3 =
       [NSString stringWithFormat:@"baz%@qux%@tot", linkFoo, linkBar];
   ranges.clear();
   ranges.push_back(std::make_pair(1, NSMakeRange(3, 3)));
   ranges.push_back(std::make_pair(2, NSMakeRange(9, 3)));
   TestLinkDetectionHelper(link3, @"bazfooquxbartot", ranges);
 }
 
 }  // namespace