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

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

 // Copyright 2016 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.
 
 #include "ios/chrome/browser/ui/history/history_service_facade.h"
 
 #include <memory>
 
-#import "base/mac/scoped_nsobject.h"
 #include "base/run_loop.h"
 #include "base/strings/string16.h"
 #include "components/history/core/browser/history_service.h"
 #include "components/history/core/browser/history_service_observer.h"
 #include "components/keyed_service/core/service_access_type.h"
 #include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
 #include "ios/chrome/browser/history/history_service_factory.h"
 #import "ios/chrome/browser/ui/history/history_entry.h"
 #import "ios/chrome/browser/ui/history/history_service_facade_delegate.h"
 #include "ios/web/public/test/test_web_thread.h"
@@ skipping 79 matching lines @@
   HistoryServiceFacadeTest() {}
   ~HistoryServiceFacadeTest() override {}
 
   void SetUp() override {
     DCHECK_CURRENTLY_ON(web::WebThread::UI);
     TestChromeBrowserState::Builder builder;
     browser_state_ = builder.Build();
     bool success = browser_state_->CreateHistoryService(true);
     EXPECT_TRUE(success);
 
-    mock_delegate_.reset([[MockHistoryServiceFacadeDelegate alloc] init]);
+    mock_delegate_ = [[MockHistoryServiceFacadeDelegate alloc] init];
     history_service_facade_.reset(
         new HistoryServiceFacade(browser_state_.get(), mock_delegate_));
   }
 
   // Cycles the runloop until the condition is met (up to 10 seconds).
   typedef base::Callback<bool(void)> WaitCondition;
   bool WaitUntilLoop(WaitCondition condition) {
     DCHECK_CURRENTLY_ON(web::WebThread::UI);
     base::Time maxDate = base::Time::Now() + base::TimeDelta::FromSeconds(10);
     while (!condition.Run()) {
@@ skipping 49 matching lines @@
   // Verify that the
   // historyServiceFacade:shouldShowNoticeAboutOtherFormsOfBrowsingHistory
   // delegate callback was called.
   bool VerifyOtherHistoryCallback() {
     return [mock_delegate_ didReceiveOtherBrowsingHistoryCallback];
   }
 
  protected:
   web::TestWebThreadBundle thread_bundle_;
   std::unique_ptr<TestChromeBrowserState> browser_state_;
-  base::scoped_nsobject<MockHistoryServiceFacadeDelegate> mock_delegate_;
+  MockHistoryServiceFacadeDelegate* mock_delegate_;
   std::unique_ptr<HistoryServiceFacade> history_service_facade_;
   GURL visited_url_;
   base::Time visited_time_;
   DISALLOW_COPY_AND_ASSIGN(HistoryServiceFacadeTest);
 };
 
 // Tests that invoking QueryHistory results in the delegate receiving an added
 // history entry.
 TEST_F(HistoryServiceFacadeTest, TestQueryHistory) {
   GURL url("http://www.testurl.com");
@@ skipping 24 matching lines @@
 
 // Tests that invoking QueryOtherFormsOfBrowsingHistory completes with callback
 // to delegate method
 // historyServiceFacade:shouldShowNoticeAboutOtherFormsOfBrowsingHistory:.
 TEST_F(HistoryServiceFacadeTest, TestQueryOtherFormsOfBrowsingHistory) {
   history_service_facade_->QueryOtherFormsOfBrowsingHistory();
   EXPECT_TRUE(WaitUntilLoop(
       base::Bind(&HistoryServiceFacadeTest::VerifyOtherHistoryCallback,
                  base::Unretained(this))));
 }