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

ios/web/test/web_int_test.h

Index: ios/web/test/web_int_test.h
diff --git a/ios/web/test/web_int_test.h b/ios/web/test/web_int_test.h
index 4bd312ebcc911e12bbe73dd1937f51adc6502bcb..0eae4bfc88ff23b11ffd6641747e2e9acb474ad9 100644
--- a/ios/web/test/web_int_test.h
+++ b/ios/web/test/web_int_test.h
@@ -71,6 +71,14 @@ class WebIntTest : public WebTest {
   std::unique_ptr<WebState> web_state_;
   // WebStateObserver used to wait for page loads.
   std::unique_ptr<IntTestWebStateObserver> observer_;
+
+  // The system autorelease pool is deallocated after some of the C++ objects
+  // have been destroyed in the test (e.g. WebThreadImpl). Therefore any
+  // autoreleased object will be deallocated after a lot of the expected
+  // is gone, causing DCHECKs on deallocation. Creating our own root pool
+  // application context ensures that autoreleased objects are released at the
+  // end of the test, not later after the C++ test objects are destroyed.
+  NSAutoreleasePool* rootPool_;
 };
 
 }  // namespace web