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

ios/chrome/browser/signin/chrome_identity_service_observer_bridge_unittest.mm

 // Copyright 2015 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/signin/chrome_identity_service_observer_bridge.h"
 
 #include <memory>
 
-#include "base/mac/scoped_nsobject.h"
 #import "ios/public/provider/chrome/browser/signin/chrome_identity.h"
 #include "ios/public/provider/chrome/browser/signin/chrome_identity_service.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 TestChromeIdentityServiceObserver
     : NSObject<ChromeIdentityServiceObserver>
 @property(nonatomic) BOOL onIdentityListChangedCalled;
 @property(nonatomic) BOOL onAccessTokenRefreshFailedCalled;
 @property(nonatomic) BOOL onProfileUpdateCalled;
 @property(nonatomic) BOOL onChromeIdentityServiceWillBeDestroyedCalled;
-@property(nonatomic, assign) ChromeIdentity* identity;
-@property(nonatomic, readonly) NSDictionary* userInfo;
+@property(nonatomic, weak) ChromeIdentity* identity;
+@property(weak, nonatomic, readonly) NSDictionary* userInfo;
 @property(nonatomic, readonly)
     ios::ChromeIdentityService::Observer* observerBridge;
 @end
 
 @implementation TestChromeIdentityServiceObserver {
   std::unique_ptr<ios::ChromeIdentityService::Observer> observer_bridge_;
 }
 
 @synthesize onIdentityListChangedCalled = _onIdentityListChangedCalled;
 @synthesize onAccessTokenRefreshFailedCalled =
@@ skipping 48 matching lines @@
 
   ios::ChromeIdentityService::Observer* GetObserverBridge() {
     return [test_observer_ observerBridge];
   }
 
   TestChromeIdentityServiceObserver* GetTestObserver() {
     return test_observer_;
   }
 
  private:
-  base::scoped_nsobject<TestChromeIdentityServiceObserver> test_observer_;
+  TestChromeIdentityServiceObserver* test_observer_;
 };
 
 // Tests that |onIdentityListChanged| is forwarded.
 TEST_F(ChromeIdentityServiceObserverBridgeTest, onIdentityListChanged) {
   ASSERT_FALSE(GetTestObserver().onIdentityListChangedCalled);
   GetObserverBridge()->OnIdentityListChanged();
   EXPECT_TRUE(GetTestObserver().onIdentityListChangedCalled);
   EXPECT_FALSE(GetTestObserver().onAccessTokenRefreshFailedCalled);
   EXPECT_FALSE(GetTestObserver().onProfileUpdateCalled);
   EXPECT_FALSE(GetTestObserver().onChromeIdentityServiceWillBeDestroyedCalled);
 }
 
 // Tests that |onAccessTokenRefreshFailed| is forwarded.
 TEST_F(ChromeIdentityServiceObserverBridgeTest, onAccessTokenRefreshFailed) {
-  base::scoped_nsobject<ChromeIdentity> identity([[ChromeIdentity alloc] init]);
+  ChromeIdentity* identity = [[ChromeIdentity alloc] init];
   NSDictionary* userInfo = [NSDictionary dictionary];
   ASSERT_FALSE(GetTestObserver().onAccessTokenRefreshFailedCalled);
   GetObserverBridge()->OnAccessTokenRefreshFailed(identity, userInfo);
   EXPECT_FALSE(GetTestObserver().onIdentityListChangedCalled);
   EXPECT_TRUE(GetTestObserver().onAccessTokenRefreshFailedCalled);
   EXPECT_FALSE(GetTestObserver().onProfileUpdateCalled);
   EXPECT_FALSE(GetTestObserver().onChromeIdentityServiceWillBeDestroyedCalled);
   EXPECT_EQ(identity, GetTestObserver().identity);
   EXPECT_NSEQ(userInfo, GetTestObserver().userInfo);
 }
 
 // Tests that |onProfileUpdate| is forwarded.
 TEST_F(ChromeIdentityServiceObserverBridgeTest, onProfileUpdate) {
-  base::scoped_nsobject<ChromeIdentity> identity([[ChromeIdentity alloc] init]);
+  ChromeIdentity* identity = [[ChromeIdentity alloc] init];
   ASSERT_FALSE(GetTestObserver().onProfileUpdateCalled);
   GetObserverBridge()->OnProfileUpdate(identity);
   EXPECT_FALSE(GetTestObserver().onIdentityListChangedCalled);
   EXPECT_FALSE(GetTestObserver().onAccessTokenRefreshFailedCalled);
   EXPECT_TRUE(GetTestObserver().onProfileUpdateCalled);
   EXPECT_FALSE(GetTestObserver().onChromeIdentityServiceWillBeDestroyedCalled);
   EXPECT_EQ(identity, GetTestObserver().identity);
 }
 
 // Tests that |onChromeIdentityServiceWillBeDestroyed| is forwarded.
 TEST_F(ChromeIdentityServiceObserverBridgeTest,
        onChromeIdentityServiceWillBeDestroyed) {
   ASSERT_FALSE(GetTestObserver().onChromeIdentityServiceWillBeDestroyedCalled);
   GetObserverBridge()->OnChromeIdentityServiceWillBeDestroyed();
   EXPECT_FALSE(GetTestObserver().onIdentityListChangedCalled);
   EXPECT_FALSE(GetTestObserver().onAccessTokenRefreshFailedCalled);
   EXPECT_FALSE(GetTestObserver().onProfileUpdateCalled);
   EXPECT_TRUE(GetTestObserver().onChromeIdentityServiceWillBeDestroyedCalled);
 }