Create a DataUseRecorder instance for each page load in Chrome.

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 55cb7e57ed1abc4347c701a643548926a040f3c1..18e706dc6d4d40b45e151073bcb3d8df5c560f66 100644
--- a/components/data_use_measurement/core/data_use.h
+++ b/components/data_use_measurement/core/data_use.h
@@ -19,6 +19,7 @@ namespace data_use_measurement {
 class DataUse {
  public:
   DataUse();
+  DataUse(const DataUse& other);
   ~DataUse();
 
   // Merge data use from another instance.
@@ -46,8 +47,6 @@ class DataUse {
 
   int64_t total_bytes_sent_;
   int64_t total_bytes_received_;
-
-  DISALLOW_COPY_AND_ASSIGN(DataUse);
 };
 
 }  // namespace data_use_measurement