Revert of [ObjC ARC] Converts ios/web:web to ARC.

ios/web/webui/web_ui_mojo_inttest.mm

Index: ios/web/webui/web_ui_mojo_inttest.mm
diff --git a/ios/web/webui/web_ui_mojo_inttest.mm b/ios/web/webui/web_ui_mojo_inttest.mm
index d45957fbf75fe5ccc5a9f0fe5d9351cacde44171..97916af543d08a09094c16c7d477a5742fa9ed32 100644
--- a/ios/web/webui/web_ui_mojo_inttest.mm
+++ b/ios/web/webui/web_ui_mojo_inttest.mm
@@ -137,22 +137,13 @@
 class WebUIMojoTest : public WebIntTest {
  protected:
   void SetUp() override {
-    @autoreleasepool {
-      WebIntTest::SetUp();
-      ui_handler_ = base::MakeUnique<TestUIHandler>();
-      web::WebState::CreateParams params(GetBrowserState());
-      web_state_ = base::MakeUnique<web::WebStateImpl>(params);
-      web_state_->GetNavigationManagerImpl().InitializeSession();
-      WebUIIOSControllerFactory::RegisterFactory(
-          new TestWebUIControllerFactory(ui_handler_.get()));
-    }
-  }
-
-  void TearDown() override {
-    @autoreleasepool {
-      web_state_.reset();
-      WebIntTest::TearDown();
-    }
+    WebIntTest::SetUp();
+    ui_handler_ = base::MakeUnique<TestUIHandler>();
+    web::WebState::CreateParams params(GetBrowserState());
+    web_state_ = base::MakeUnique<web::WebStateImpl>(params);
+    web_state_->GetNavigationManagerImpl().InitializeSession();
+    WebUIIOSControllerFactory::RegisterFactory(
+        new TestWebUIControllerFactory(ui_handler_.get()));
   }
 
   // Returns WebState which loads test WebUI page.
@@ -175,33 +166,31 @@
 #endif
 // TODO(crbug.com/720098): Enable this test on device.
 TEST_F(WebUIMojoTest, MAYBE_MessageExchange) {
-  @autoreleasepool {
-    web_state()->SetWebUsageEnabled(true);
-    web_state()->GetView();  // WebState won't load URL without view.
-    GURL url(url::SchemeHostPort(kTestWebUIScheme, kTestWebUIURLHost, 0)
-                 .Serialize());
-    NavigationManager::WebLoadParams load_params(url);
-    web_state()->GetNavigationManager()->LoadURLWithParams(load_params);
+  web_state()->SetWebUsageEnabled(true);
+  web_state()->GetView();  // WebState won't load URL without view.
+  GURL url(
+      url::SchemeHostPort(kTestWebUIScheme, kTestWebUIURLHost, 0).Serialize());
+  NavigationManager::WebLoadParams load_params(url);
+  web_state()->GetNavigationManager()->LoadURLWithParams(load_params);
 
-    // Wait until |TestUIHandler| receives "fin" message from WebUI page.
-    bool fin_received = testing::WaitUntilConditionOrTimeout(kMessageTimeout, ^{
-      // Flush any pending tasks. Don't RunUntilIdle() because
-      // RunUntilIdle() is incompatible with mojo::SimpleWatcher's
-      // automatic arming behavior, which Mojo JS still depends upon.
-      //
-      // TODO(crbug.com/701875): Introduce the full watcher API to JS and get
-      // rid of this hack.
-      base::RunLoop loop;
-      base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
-                                                    loop.QuitClosure());
-      loop.Run();
-      return test_ui_handler()->IsFinReceived();
-    });
+  // Wait until |TestUIHandler| receives "fin" message from WebUI page.
+  bool fin_received = testing::WaitUntilConditionOrTimeout(kMessageTimeout, ^{
+    // Flush any pending tasks. Don't RunUntilIdle() because
+    // RunUntilIdle() is incompatible with mojo::SimpleWatcher's
+    // automatic arming behavior, which Mojo JS still depends upon.
+    //
+    // TODO(crbug.com/701875): Introduce the full watcher API to JS and get rid
+    // of this hack.
+    base::RunLoop loop;
+    base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
+                                                  loop.QuitClosure());
+    loop.Run();
+    return test_ui_handler()->IsFinReceived();
+  });
 
-    ASSERT_TRUE(fin_received);
-    EXPECT_FALSE(web_state()->IsLoading());
-    EXPECT_EQ(url, web_state()->GetLastCommittedURL());
-  }
+  ASSERT_TRUE(fin_received);
+  EXPECT_FALSE(web_state()->IsLoading());
+  EXPECT_EQ(url, web_state()->GetLastCommittedURL());
 }
 
 }  // namespace web