Add a Physical Web data source

ios/chrome/browser/application_context_impl.h

Index: ios/chrome/browser/application_context_impl.h
diff --git a/ios/chrome/browser/application_context_impl.h b/ios/chrome/browser/application_context_impl.h
index f33e34f0a68ab0f46a4ae08fbc50006b0fd4bd3c..ba961f231e73b9113abd7f9f3f8412deee5ca271 100644
--- a/ios/chrome/browser/application_context_impl.h
+++ b/ios/chrome/browser/application_context_impl.h
@@ -64,6 +64,7 @@ class ApplicationContextImpl : public ApplicationContext {
   component_updater::ComponentUpdateService* GetComponentUpdateService()
       override;
   CRLSetFetcher* GetCRLSetFetcher() override;
+  PhysicalWebDataSource* GetPhysicalWebDataSource() override;
 
  private:
   // Sets the locale used by the application.
@@ -87,6 +88,7 @@ class ApplicationContextImpl : public ApplicationContext {
   scoped_refptr<CRLSetFetcher> crl_set_fetcher_;
   std::unique_ptr<ios::ChromeBrowserStateManager> chrome_browser_state_manager_;
   std::string application_locale_;
+  std::unique_ptr<PhysicalWebDataSource> physical_web_data_source_;
 
   // Sequenced task runner for local state related I/O tasks.
   const scoped_refptr<base::SequencedTaskRunner> local_state_task_runner_;