Implement GetBrowsingDataRemoverDelegate() for BrowserContext subclasses

headless/lib/browser/headless_browser_context_impl.cc

Index: headless/lib/browser/headless_browser_context_impl.cc
diff --git a/headless/lib/browser/headless_browser_context_impl.cc b/headless/lib/browser/headless_browser_context_impl.cc
index f5cc5c6fe06e1ac17b5f6b89ac577b5c2ff1026b..0f4fd1095b46b2d51c7ad2e7066d2aee52d2bfee 100644
--- a/headless/lib/browser/headless_browser_context_impl.cc
+++ b/headless/lib/browser/headless_browser_context_impl.cc
@@ -241,6 +241,11 @@ HeadlessBrowserContextImpl::GetBackgroundSyncController() {
   return nullptr;
 }
 
+content::BrowsingDataRemoverDelegate*
+HeadlessBrowserContextImpl::GetBrowsingDataRemoverDelegate() {
+  return nullptr;
+}
+
 net::URLRequestContextGetter* HeadlessBrowserContextImpl::CreateRequestContext(
     content::ProtocolHandlerMap* protocol_handlers,
     content::URLRequestInterceptorScopedVector request_interceptors) {