Cleanup ios/web_view.

ios/web_view/internal/translate/criwv_translate_manager_impl.mm

Index: ios/web_view/internal/translate/criwv_translate_manager_impl.mm
diff --git a/ios/web_view/internal/translate/criwv_translate_manager_impl.mm b/ios/web_view/internal/translate/criwv_translate_manager_impl.mm
index af0920f9677c1c425d0ba44daa98e3fb92aaeb8b..8d7f768c95a821c4f5d829035cb33f0ca6271924 100644
--- a/ios/web_view/internal/translate/criwv_translate_manager_impl.mm
+++ b/ios/web_view/internal/translate/criwv_translate_manager_impl.mm
@@ -5,23 +5,21 @@
 #import "ios/web_view/internal/translate/criwv_translate_manager_impl.h"
 
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "components/translate/core/browser/translate_manager.h"
 #include "components/translate/core/browser/translate_ui_delegate.h"
 
-@interface CRIWVTranslateManagerImpl () {
+@implementation CRIWVTranslateManagerImpl {
   std::unique_ptr<translate::TranslateUIDelegate> _translateUIDelegate;
 }
-@end
-
-@implementation CRIWVTranslateManagerImpl
 
 - (instancetype)initWithTranslateManager:(translate::TranslateManager*)manager
                           sourceLanguage:(const std::string&)source
                           targetLanguage:(const std::string&)target {
   if ((self = [super init])) {
     DCHECK(manager);
-    _translateUIDelegate.reset(new translate::TranslateUIDelegate(
-        manager->GetWeakPtr(), source, target));
+    _translateUIDelegate = base::MakeUnique<translate::TranslateUIDelegate>(
+        manager->GetWeakPtr(), source, target);
   }
   return self;
 }