Implement Physical Web listener registration

ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h

Index: ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h
diff --git a/ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h b/ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h
index 1c0c1d425cb978f62e5caef869725b43696959dd..a21a2a6b7cf9a4ab8060fc6c8c200f0668ef2046 100644
--- a/ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h
+++ b/ios/chrome/common/physical_web/ios_chrome_physical_web_data_source.h
@@ -7,7 +7,7 @@
 
 #include "base/macros.h"
 #import "base/mac/scoped_nsobject.h"
-#include "components/physical_web/data_source/physical_web_data_source.h"
+#include "components/physical_web/data_source/physical_web_data_source_impl.h"
 
 namespace base {
 class ListValue;
@@ -17,7 +17,7 @@ class PhysicalWebListener;
 @class PhysicalWebScanner;
 
 // iOS implementation of PhysicalWebDataSource
-class IOSChromePhysicalWebDataSource : public PhysicalWebDataSource {
+class IOSChromePhysicalWebDataSource : public PhysicalWebDataSourceImpl {
  public:
   IOSChromePhysicalWebDataSource();
   ~IOSChromePhysicalWebDataSource() override;
@@ -37,12 +37,6 @@ class IOSChromePhysicalWebDataSource : public PhysicalWebDataSource {
   // or more discovered URLs that have not been sent to the resolution service.
   bool HasUnresolvedDiscoveries() override;
 
-  // Register for changes to Physical Web URLs and associated page metadata.
-  void RegisterListener(PhysicalWebListener* physical_web_listener) override;
-
-  // Unregister for changes to Physical Web URLs and associated page metadata.
-  void UnregisterListener(PhysicalWebListener* physical_web_listener) override;
-
  private:
   // Scanner for nearby Physical Web URL devices.
   base::scoped_nsobject<PhysicalWebScanner> scanner_;