[PhysicalWeb] Add physical_web namespace.

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 5c2e47433f76b1eb0a4f19cdfdf9ecae62d99ebc..63e818b115f4532205fac7c7ad7d35ea1b9dcb2c 100644
--- a/components/omnibox/browser/autocomplete_provider_client.h
+++ b/components/omnibox/browser/autocomplete_provider_client.h
@@ -22,7 +22,6 @@ class AutocompleteSchemeClassifier;
 class GURL;
 class InMemoryURLIndex;
 class KeywordProvider;
-class PhysicalWebDataSource;
 class PrefService;
 class ShortcutsBackend;
 
@@ -39,6 +38,10 @@ namespace net {
 class URLRequestContextGetter;
 }
 
+namespace physical_web {
+class PhysicalWebDataSource;
+}
+
 class SearchTermsData;
 class TemplateURLService;
 
@@ -62,7 +65,7 @@ class AutocompleteProviderClient {
   virtual scoped_refptr<ShortcutsBackend> GetShortcutsBackendIfExists() = 0;
   virtual std::unique_ptr<KeywordExtensionsDelegate>
   GetKeywordExtensionsDelegate(KeywordProvider* keyword_provider) = 0;
-  virtual PhysicalWebDataSource* GetPhysicalWebDataSource() = 0;
+  virtual physical_web::PhysicalWebDataSource* GetPhysicalWebDataSource() = 0;
 
   // The value to use for Accept-Languages HTTP header when making an HTTP
   // request.