[ObjC ARC] Converts ios/chrome/app/safe_mode:unit_tests to ARC.

ios/chrome/app/safe_mode/safe_mode_view_controller_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.
 
-#include "base/mac/scoped_nsobject.h"
 #import "breakpad/src/client/ios/BreakpadController.h"
 #import "ios/chrome/app/safe_mode/safe_mode_view_controller.h"
 #import "ios/chrome/browser/crash_report/breakpad_helper.h"
 #import "ios/chrome/test/base/scoped_block_swizzler.h"
 #import "ios/chrome/test/ocmock/OCMockObject+BreakpadControllerTesting.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 #import "third_party/ocmock/OCMock/OCMock.h"
 #include "third_party/ocmock/gtest_support.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 const int kCrashReportCount = 2;
 
 class SafeModeViewControllerTest : public PlatformTest {
  public:
   void SetUp() override {
     PlatformTest::SetUp();
 
-    mock_breakpad_controller_.reset(
-        [[OCMockObject mockForClass:[BreakpadController class]] retain]);
+    mock_breakpad_controller_ =
+        [OCMockObject mockForClass:[BreakpadController class]];
 
     // Swizzle +[BreakpadController sharedInstance] to return
     // |mock_breakpad_controller_| instead of the normal singleton instance.
     id implementation_block = ^BreakpadController*(id self) {
-      return mock_breakpad_controller_.get();
+      return mock_breakpad_controller_;
     };
     breakpad_controller_shared_instance_swizzler_.reset(new ScopedBlockSwizzler(
         [BreakpadController class], @selector(sharedInstance),
         implementation_block));
   }
 
   void TearDown() override {
     [[mock_breakpad_controller_ stub] stop];
     breakpad_helper::SetEnabled(false);
 
     PlatformTest::TearDown();
   }
 
  protected:
-  base::scoped_nsobject<id> mock_breakpad_controller_;
+  id mock_breakpad_controller_;
   std::unique_ptr<ScopedBlockSwizzler>
       breakpad_controller_shared_instance_swizzler_;
 };
 
 // Verify that +[SafeModeViewController hasSuggestions] returns YES if and only
 // if crash reporter and crash report uploading are enabled and there are
 // multiple crash reports to upload.
 TEST_F(SafeModeViewControllerTest, HasSuggestions) {
   // Test when crash reporter is disabled.
   breakpad_helper::SetEnabled(false);
-  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_.get());
+  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_);
   EXPECT_FALSE([SafeModeViewController hasSuggestions]);
 
   breakpad_helper::SetUploadingEnabled(false);
-  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_.get());
+  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_);
   EXPECT_FALSE([SafeModeViewController hasSuggestions]);
 
   breakpad_helper::SetUploadingEnabled(true);
-  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_.get());
+  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_);
   EXPECT_FALSE([SafeModeViewController hasSuggestions]);
 
   // Test when crash reporter is enabled.
   [[mock_breakpad_controller_ expect] start:NO];
   breakpad_helper::SetEnabled(true);
-  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_.get());
+  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_);
   EXPECT_FALSE([SafeModeViewController hasSuggestions]);
 
   [[mock_breakpad_controller_ expect] setUploadingEnabled:NO];
   breakpad_helper::SetUploadingEnabled(false);
-  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_.get());
+  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_);
   EXPECT_FALSE([SafeModeViewController hasSuggestions]);
 
   // Test when crash reporter and crash report uploading are enabled.
   [[mock_breakpad_controller_ expect] setUploadingEnabled:YES];
   breakpad_helper::SetUploadingEnabled(true);
-  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_.get());
+  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_);
 
   [mock_breakpad_controller_ cr_expectGetCrashReportCount:0];
   EXPECT_FALSE([SafeModeViewController hasSuggestions]);
-  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_.get());
+  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_);
 
   [mock_breakpad_controller_ cr_expectGetCrashReportCount:kCrashReportCount];
   EXPECT_TRUE([SafeModeViewController hasSuggestions]);
-  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_.get());
+  EXPECT_OCMOCK_VERIFY(mock_breakpad_controller_);
 }
 
 }  // namespace