Standardize which page loads are tracked

components/page_load_metrics/common/page_load_timing.h

Index: components/page_load_metrics/common/page_load_timing.h
diff --git a/components/page_load_metrics/common/page_load_timing.h b/components/page_load_metrics/common/page_load_timing.h
index 8d44cfca4c9a8ccee795748ffae679fccef5c42f..670e319d006519dabce69ef3bb8f9af30e3f353f 100644
--- a/components/page_load_metrics/common/page_load_timing.h
+++ b/components/page_load_metrics/common/page_load_timing.h
@@ -21,6 +21,9 @@ struct PageLoadTiming {
   ~PageLoadTiming();
 
   bool operator==(const PageLoadTiming& other) const;
+  bool operator!=(const PageLoadTiming& other) const {
+    return !(*this == other);
+  }
 
   bool IsEmpty() const;