[PhysicalWeb] Add physical_web namespace.

chrome/browser/autocomplete/chrome_autocomplete_provider_client.h

Index: chrome/browser/autocomplete/chrome_autocomplete_provider_client.h
diff --git a/chrome/browser/autocomplete/chrome_autocomplete_provider_client.h b/chrome/browser/autocomplete/chrome_autocomplete_provider_client.h
index fffdf11b9084dcb94c34ba6d7395c26f77058fcf..c5b284e04d26bc115846ba484c9d0f274746e43a 100644
--- a/chrome/browser/autocomplete/chrome_autocomplete_provider_client.h
+++ b/chrome/browser/autocomplete/chrome_autocomplete_provider_client.h
@@ -34,7 +34,7 @@ class ChromeAutocompleteProviderClient : public AutocompleteProviderClient {
   scoped_refptr<ShortcutsBackend> GetShortcutsBackendIfExists() override;
   std::unique_ptr<KeywordExtensionsDelegate> GetKeywordExtensionsDelegate(
       KeywordProvider* keyword_provider) override;
-  PhysicalWebDataSource* GetPhysicalWebDataSource() override;
+  physical_web::PhysicalWebDataSource* GetPhysicalWebDataSource() override;
   std::string GetAcceptLanguages() const override;
   std::string GetEmbedderRepresentationOfAboutScheme() override;
   std::vector<base::string16> GetBuiltinURLs() override;