Support moving pending requests from one DataUseRecorder to another

components/data_use_measurement/core/data_use.h

Index: components/data_use_measurement/core/data_use.h
diff --git a/components/data_use_measurement/core/data_use.h b/components/data_use_measurement/core/data_use.h
index 6a1c950e5859f3ff781808d8736c522a68333828..d9b41e2bb7ef28f77eb7886c216dd2e777944807 100644
--- a/components/data_use_measurement/core/data_use.h
+++ b/components/data_use_measurement/core/data_use.h
@@ -40,11 +40,6 @@ class DataUse : public base::SupportsUserData {
   explicit DataUse(TrafficType traffic_type);
   ~DataUse() override;
 
-  // Merge data use from another instance.
-  // TODO(rajendrant): Check if the merge can be removed. Otherwise user data
-  // needs to support mergeability.
-  void MergeFrom(const DataUse& other);
-
   // Returns the page URL.
   const GURL& url() const { return url_; }