Remove GetMetadata from PhysicalWebDataSource and PhysicalWebScanner

ios/chrome/browser/physical_web/ios_chrome_physical_web_data_source.h

Index: ios/chrome/browser/physical_web/ios_chrome_physical_web_data_source.h
diff --git a/ios/chrome/browser/physical_web/ios_chrome_physical_web_data_source.h b/ios/chrome/browser/physical_web/ios_chrome_physical_web_data_source.h
index c41f61e7c6aa1fe4602a41e25911e732e96af2f5..223ba7efd56b4858c92ba8f0c3d75e47240603a0 100644
--- a/ios/chrome/browser/physical_web/ios_chrome_physical_web_data_source.h
+++ b/ios/chrome/browser/physical_web/ios_chrome_physical_web_data_source.h
@@ -9,9 +9,6 @@
 #import "base/mac/scoped_nsobject.h"
 #include "components/physical_web/data_source/physical_web_data_source_impl.h"
 
-namespace base {
-class ListValue;
-}
 class PrefService;
 
 @class PhysicalWebScanner;
@@ -33,10 +30,6 @@ class IOSChromePhysicalWebDataSource
 
   // Returns a list of resolved URLs and associated page metadata. If network
   // requests are disabled, the list will be empty.
-  std::unique_ptr<base::ListValue> GetMetadata() override;
-
-  // Returns a list of resolved URLs and associated page metadata. If network
-  // requests are disabled, the list will be empty.
   std::unique_ptr<physical_web::MetadataList> GetMetadataList() override;
 
   // Returns boolean |true| if network requests are disabled and there are one