Switch SupportsUserData uses to use unique_ptr.

ios/web/web_state/ui/wk_web_view_configuration_provider.mm

Index: ios/web/web_state/ui/wk_web_view_configuration_provider.mm
diff --git a/ios/web/web_state/ui/wk_web_view_configuration_provider.mm b/ios/web/web_state/ui/wk_web_view_configuration_provider.mm
index 17d135e230c0458ad15ed689c3015c2010e9e113..e3386c5b0ad89d12ccc5f5c55095f40c906879fe 100644
--- a/ios/web/web_state/ui/wk_web_view_configuration_provider.mm
+++ b/ios/web/web_state/ui/wk_web_view_configuration_provider.mm
@@ -9,6 +9,7 @@
 
 #import "base/ios/weak_nsobject.h"
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "ios/web/public/browser_state.h"
 #import "ios/web/web_state/js/page_script_util.h"
 #import "ios/web/web_state/ui/crw_wk_script_message_router.h"
@@ -38,7 +39,7 @@ WKWebViewConfigurationProvider::FromBrowserState(BrowserState* browser_state) {
   if (!browser_state->GetUserData(kWKWebViewConfigProviderKeyName)) {
     browser_state->SetUserData(
         kWKWebViewConfigProviderKeyName,
-        new WKWebViewConfigurationProvider(browser_state));
+        base::WrapUnique(new WKWebViewConfigurationProvider(browser_state)));
   }
   return *(static_cast<WKWebViewConfigurationProvider*>(
       browser_state->GetUserData(kWKWebViewConfigProviderKeyName)));