Add a Physical Web omnibox autocomplete provider

components/omnibox/browser/autocomplete_provider_client.h

Index: components/omnibox/browser/autocomplete_provider_client.h
diff --git a/components/omnibox/browser/autocomplete_provider_client.h b/components/omnibox/browser/autocomplete_provider_client.h
index 80211f51a2f5b89c21a524b8fcfc3122a23a13ed..5c2e47433f76b1eb0a4f19cdfdf9ecae62d99ebc 100644
--- a/components/omnibox/browser/autocomplete_provider_client.h
+++ b/components/omnibox/browser/autocomplete_provider_client.h
@@ -22,6 +22,7 @@ class AutocompleteSchemeClassifier;
 class GURL;
 class InMemoryURLIndex;
 class KeywordProvider;
+class PhysicalWebDataSource;
 class PrefService;
 class ShortcutsBackend;
 
@@ -61,6 +62,7 @@ class AutocompleteProviderClient {
   virtual scoped_refptr<ShortcutsBackend> GetShortcutsBackendIfExists() = 0;
   virtual std::unique_ptr<KeywordExtensionsDelegate>
   GetKeywordExtensionsDelegate(KeywordProvider* keyword_provider) = 0;
+  virtual PhysicalWebDataSource* GetPhysicalWebDataSource() = 0;
 
   // The value to use for Accept-Languages HTTP header when making an HTTP
   // request.