Revert "Updated ownership of NavigationItems within CRWSessionController."

ios/web/navigation/crw_session_entry_unittest.mm

Index: ios/web/navigation/crw_session_entry_unittest.mm
diff --git a/ios/web/navigation/crw_session_entry_unittest.mm b/ios/web/navigation/crw_session_entry_unittest.mm
index 9c0f05faf55d6829fc7dc1ee072552f8b9e14c76..a5b932392390bdd31194fbc5619330b78f3f81d5 100644
--- a/ios/web/navigation/crw_session_entry_unittest.mm
+++ b/ios/web/navigation/crw_session_entry_unittest.mm
@@ -33,18 +33,18 @@ void SetUp() override {
     GURL url("http://init.test");
     ui::PageTransition transition =
         ui::PAGE_TRANSITION_AUTO_BOOKMARK;
-    item_.reset(new web::NavigationItemImpl());
-    item_->SetOriginalRequestURL(url);
-    item_->SetURL(url);
-    item_->SetTransitionType(transition);
-    item_->SetTimestamp(base::Time::Now());
-    item_->SetPostData([@"Test data" dataUsingEncoding:NSUTF8StringEncoding]);
+    std::unique_ptr<web::NavigationItemImpl> item(
+        new web::NavigationItemImpl());
+    item->SetOriginalRequestURL(url);
+    item->SetURL(url);
+    item->SetTransitionType(transition);
+    item->SetTimestamp(base::Time::Now());
+    item->SetPostData([@"Test data" dataUsingEncoding:NSUTF8StringEncoding]);
     session_entry_.reset(
-        [[CRWSessionEntry alloc] initWithNavigationItem:item_.get()]);
+        [[CRWSessionEntry alloc] initWithNavigationItem:std::move(item)]);
   }
 
  protected:
-  std::unique_ptr<web::NavigationItemImpl> item_;
   base::scoped_nsobject<CRWSessionEntry> session_entry_;
 };