Use GURLs in Physical Web data source

components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc

Index: components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc
diff --git a/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc b/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc
index 93179bd19c533fa3fd238a4f18df88bd9cd228e0..94c2eb8957a49628be9e0693b30c309425fd4099 100644
--- a/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc
+++ b/components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc
@@ -224,17 +224,17 @@ ContentSuggestion PhysicalWebPageSuggestionsProvider::ConvertPhysicalWebPage(
 }
 
 // PhysicalWebListener implementation.
-void PhysicalWebPageSuggestionsProvider::OnFound(const std::string& url) {
+void PhysicalWebPageSuggestionsProvider::OnFound(const GURL& url) {
   FetchPhysicalWebPages();
 }
 
-void PhysicalWebPageSuggestionsProvider::OnLost(const std::string& url) {
+void PhysicalWebPageSuggestionsProvider::OnLost(const GURL& url) {
   // TODO(vitaliii): Do not refetch, but just update the current state.
   FetchPhysicalWebPages();
 }
 
 void PhysicalWebPageSuggestionsProvider::OnDistanceChanged(
-    const std::string& url,
+    const GURL& url,
     double distance_estimate) {
   FetchPhysicalWebPages();
 }