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

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

Index: ios/chrome/browser/ui/history/history_search_view_controller_unittest.mm
diff --git a/ios/chrome/browser/ui/history/history_search_view_controller_unittest.mm b/ios/chrome/browser/ui/history/history_search_view_controller_unittest.mm
index db0f24e32c9cc6f894c7e4380bf63492838ed808..480434a17a0eacdd2dc2c57584cd4a63a4caf2aa 100644
--- a/ios/chrome/browser/ui/history/history_search_view_controller_unittest.mm
+++ b/ios/chrome/browser/ui/history/history_search_view_controller_unittest.mm
@@ -5,12 +5,15 @@
 #import "ios/chrome/browser/ui/history/history_search_view_controller.h"
 
 #include "base/mac/foundation_util.h"
-#import "base/mac/scoped_nsobject.h"
 #import "ios/chrome/browser/ui/history/history_search_view.h"
 #include "testing/platform_test.h"
 #import "third_party/ocmock/OCMock/OCMock.h"
 #import "third_party/ocmock/gtest_support.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // HistorySearchView category to expose the text field and cancel button.
 @interface HistorySearchView (Testing)
 @property(nonatomic, strong) UITextField* textField;
@@ -21,27 +24,25 @@
 class HistorySearchViewControllerTest : public PlatformTest {
  public:
   HistorySearchViewControllerTest() {
-    search_view_controller_.reset([[HistorySearchViewController alloc] init]);
+    search_view_controller_ = [[HistorySearchViewController alloc] init];
     [search_view_controller_ loadView];
-    mock_delegate_.reset([[OCMockObject
-        mockForProtocol:@protocol(HistorySearchViewControllerDelegate)]
-        retain]);
+    mock_delegate_ = [OCMockObject
+        mockForProtocol:@protocol(HistorySearchViewControllerDelegate)];
     [search_view_controller_ setDelegate:mock_delegate_];
   }
 
  protected:
-  base::scoped_nsobject<HistorySearchViewController> search_view_controller_;
-  base::scoped_nsprotocol<id<HistorySearchViewControllerDelegate>>
-      mock_delegate_;
+  __strong HistorySearchViewController* search_view_controller_;
+  __strong id<HistorySearchViewControllerDelegate> mock_delegate_;
 };
 
 // Test that pressing the cancel button invokes delegate callback to cancel
 // search.
 TEST_F(HistorySearchViewControllerTest, CancelButtonPressed) {
-  UIButton* cancel_button = base::mac::ObjCCastStrict<HistorySearchView>(
-                                search_view_controller_.get().view)
-                                .cancelButton;
-  OCMockObject* mock_delegate = (OCMockObject*)mock_delegate_.get();
+  UIButton* cancel_button =
+      base::mac::ObjCCastStrict<HistorySearchView>(search_view_controller_.view)
+          .cancelButton;
+  OCMockObject* mock_delegate = (OCMockObject*)mock_delegate_;
   [[mock_delegate expect]
       historySearchViewControllerDidCancel:search_view_controller_];
   [cancel_button sendActionsForControlEvents:UIControlEventTouchUpInside];
@@ -52,10 +53,10 @@ TEST_F(HistorySearchViewControllerTest, CancelButtonPressed) {
 // textField:shouldChangeCharactersInRange:replacementString: on the text field
 // delegate results invokes delegate callback to request search.
 TEST_F(HistorySearchViewControllerTest, SearchButtonPressed) {
-  UITextField* text_field = base::mac::ObjCCastStrict<HistorySearchView>(
-                                search_view_controller_.get().view)
-                                .textField;
-  OCMockObject* mock_delegate = (OCMockObject*)mock_delegate_.get();
+  UITextField* text_field =
+      base::mac::ObjCCastStrict<HistorySearchView>(search_view_controller_.view)
+          .textField;
+  OCMockObject* mock_delegate = (OCMockObject*)mock_delegate_;
   [[mock_delegate expect] historySearchViewController:search_view_controller_
                               didRequestSearchForTerm:@"a"];
   [text_field.delegate textField:text_field
@@ -67,15 +68,15 @@ TEST_F(HistorySearchViewControllerTest, SearchButtonPressed) {
 // Test that disabling HistorySearchViewController disables the search view text
 // field.
 TEST_F(HistorySearchViewControllerTest, DisableSearchBar) {
-  UITextField* text_field = base::mac::ObjCCastStrict<HistorySearchView>(
-                                search_view_controller_.get().view)
-                                .textField;
+  UITextField* text_field =
+      base::mac::ObjCCastStrict<HistorySearchView>(search_view_controller_.view)
+          .textField;
   DCHECK(text_field);
   EXPECT_TRUE(text_field.enabled);
 
-  search_view_controller_.get().enabled = NO;
+  search_view_controller_.enabled = NO;
   EXPECT_FALSE(text_field.enabled);
 
-  search_view_controller_.get().enabled = YES;
+  search_view_controller_.enabled = YES;
   EXPECT_TRUE(text_field.enabled);
 }