Remove GetMetadata from PhysicalWebDataSource and PhysicalWebScanner

components/physical_web/data_source/physical_web_data_source.cc

Index: components/physical_web/data_source/physical_web_data_source.cc
diff --git a/components/physical_web/data_source/physical_web_data_source.cc b/components/physical_web/data_source/physical_web_data_source.cc
index cd2a204f5f79a3cfc7648fe8bcbbb7ce00c371cc..f3fea842ee3ea9f09dc2d66c10d953f72c301bff 100644
--- a/components/physical_web/data_source/physical_web_data_source.cc
+++ b/components/physical_web/data_source/physical_web_data_source.cc
@@ -6,15 +6,6 @@
 
 namespace physical_web {
 
-const char kDescriptionKey[] = "description";
-const char kDistanceEstimateKey[] = "distanceEstimate";
-const char kGroupIdKey[] = "groupId";
-const char kIconUrlKey[] = "icon";
-const char kResolvedUrlKey[] = "resolvedUrl";
-const char kScanTimestampKey[] = "scanTimestamp";
-const char kScannedUrlKey[] = "scannedUrl";
-const char kTitleKey[] = "title";
-
 Metadata::Metadata() {}
 
 Metadata::Metadata(const Metadata& other) = default;