[ObjC ARC] Converts crw_web_controller to ARC.

ios/web/web_state/ui/crw_web_controller_container_view.mm

Index: ios/web/web_state/ui/crw_web_controller_container_view.mm
diff --git a/ios/web/web_state/ui/crw_web_controller_container_view.mm b/ios/web/web_state/ui/crw_web_controller_container_view.mm
index 754d9e8b814f4d013b8d1d24e9f24cf48d3314e0..d6a885fcadec8949a2c00facd55b3e33f4bcaea3 100644
--- a/ios/web/web_state/ui/crw_web_controller_container_view.mm
+++ b/ios/web/web_state/ui/crw_web_controller_container_view.mm
@@ -152,6 +152,14 @@
 
 #pragma mark Accessors
 
+- (id<CRWWebControllerContainerViewDelegate>)delegate {
+  return _delegate.get();
+}
+
+- (void)setDelegate:(id<CRWWebControllerContainerViewDelegate>)delegate {
+  _delegate.reset(delegate);
+}
+
 - (CRWWebViewContentView*)webViewContentView {
   return _webViewContentView.get();
 }