Create MetricsPrivateDelegate for metricsPrivate behavior

chrome/browser/extensions/api/chrome_extensions_api_client.cc

Index: chrome/browser/extensions/api/chrome_extensions_api_client.cc
diff --git a/chrome/browser/extensions/api/chrome_extensions_api_client.cc b/chrome/browser/extensions/api/chrome_extensions_api_client.cc
index a2471e0ffc4c9cee83da3c56ff1e2c17df358d88..f4aecac0b8709ccad267aa9ff19a717976df830d 100644
--- a/chrome/browser/extensions/api/chrome_extensions_api_client.cc
+++ b/chrome/browser/extensions/api/chrome_extensions_api_client.cc
@@ -12,6 +12,7 @@
 #include "chrome/browser/extensions/api/declarative_content/chrome_content_rules_registry.h"
 #include "chrome/browser/extensions/api/declarative_content/default_content_predicate_evaluators.h"
 #include "chrome/browser/extensions/api/management/chrome_management_api_delegate.h"
+#include "chrome/browser/extensions/api/metrics_private/chrome_metrics_private_delegate.h"
 #include "chrome/browser/extensions/api/storage/managed_value_store_cache.h"
 #include "chrome/browser/extensions/api/storage/sync_value_store_cache.h"
 #include "chrome/browser/extensions/api/web_request/chrome_extension_web_request_event_router_delegate.h"
@@ -155,4 +156,9 @@ ManagementAPIDelegate* ChromeExtensionsAPIClient::CreateManagementAPIDelegate()
   return new ChromeManagementAPIDelegate;
 }
 
+std::unique_ptr<MetricsPrivateDelegate>
+ChromeExtensionsAPIClient::CreateMetricsPrivateDelegate() const {
+  return base::MakeUnique<ChromeMetricsPrivateDelegate>();
+}
+
 }  // namespace extensions