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

ios/chrome/browser/ui/history/history_entries_status_item_unittest.mm

Index: ios/chrome/browser/ui/history/history_entries_status_item_unittest.mm
diff --git a/ios/chrome/browser/ui/history/history_entries_status_item_unittest.mm b/ios/chrome/browser/ui/history/history_entries_status_item_unittest.mm
index 4c8ea460785931692b7b5e80c3ebdb1a28ce400a..130a919ecadafba7fb9065d4ec084dec3ced647e 100644
--- a/ios/chrome/browser/ui/history/history_entries_status_item_unittest.mm
+++ b/ios/chrome/browser/ui/history/history_entries_status_item_unittest.mm
@@ -19,6 +19,10 @@
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // Mock delegate for HistoryEntriesStatusItem. Implement mock delegate rather
 // than use OCMock because delegate method takes a GURL as a parameter.
 @interface MockEntriesStatusItemDelegate
@@ -50,10 +54,9 @@ namespace {
 // property set to YES results in an empty label.
 TEST(HistoryEntriesStatusItemTest, TestHidden) {
   HistoryEntriesStatusItem* item =
-      [[[HistoryEntriesStatusItem alloc] initWithType:0] autorelease];
+      [[HistoryEntriesStatusItem alloc] initWithType:0];
   item.hidden = YES;
-  HistoryEntriesStatusCell* cell =
-      [[[HistoryEntriesStatusCell alloc] init] autorelease];
+  HistoryEntriesStatusCell* cell = [[HistoryEntriesStatusCell alloc] init];
   [item configureCell:cell];
   EXPECT_FALSE(cell.textLabel.text);
 }
@@ -62,9 +65,8 @@ TEST(HistoryEntriesStatusItemTest, TestHidden) {
 // possible HistoryEntriesStatus values shows a label with the correct text.
 TEST(HistoryEntriesStatusItemTest, TestEntriesStatus) {
   HistoryEntriesStatusItem* item =
-      [[[HistoryEntriesStatusItem alloc] initWithType:0] autorelease];
-  HistoryEntriesStatusCell* cell =
-      [[[HistoryEntriesStatusCell alloc] init] autorelease];
+      [[HistoryEntriesStatusItem alloc] initWithType:0];
+  HistoryEntriesStatusCell* cell = [[HistoryEntriesStatusCell alloc] init];
   NSRange range;
 
   item.entriesStatus = NO_ENTRIES;
@@ -92,9 +94,8 @@ TEST(HistoryEntriesStatusItemTest, TestEntriesStatus) {
 // data text to the label.
 TEST(HistoryEntriesStatusItemTest, TestOtherBrowsingDataNotice) {
   HistoryEntriesStatusItem* item =
-      [[[HistoryEntriesStatusItem alloc] initWithType:0] autorelease];
-  HistoryEntriesStatusCell* cell =
-      [[[HistoryEntriesStatusCell alloc] init] autorelease];
+      [[HistoryEntriesStatusItem alloc] initWithType:0];
+  HistoryEntriesStatusCell* cell = [[HistoryEntriesStatusCell alloc] init];
   item.hidden = NO;
   item.entriesStatus = SYNCED_ENTRIES;
   item.showsOtherBrowsingDataNotice = YES;
@@ -114,11 +115,10 @@ TEST(HistoryEntriesStatusItemTest, TestOtherBrowsingDataNotice) {
 // the HistoryEntriesStatusItemDelegate method.
 TEST(HistoryEntriesStatusItemTest, TestDelegate) {
   HistoryEntriesStatusItem* item =
-      [[[HistoryEntriesStatusItem alloc] initWithType:0] autorelease];
-  HistoryEntriesStatusCell* cell =
-      [[[HistoryEntriesStatusCell alloc] init] autorelease];
+      [[HistoryEntriesStatusItem alloc] initWithType:0];
+  HistoryEntriesStatusCell* cell = [[HistoryEntriesStatusCell alloc] init];
   MockEntriesStatusItemDelegate* delegate =
-      [[[MockEntriesStatusItemDelegate alloc] init] autorelease];
+      [[MockEntriesStatusItemDelegate alloc] init];
   item.delegate = delegate;
   item.hidden = NO;
   item.entriesStatus = SYNCED_ENTRIES;