Sets correct ActivityLog enabled status to the first renderer process

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index b7f954c946c1713f799b8a926d7e12384cbcf151..ff0b6faf75936d1de45c3f44f8ba7a683a1a9391 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -2506,4 +2506,9 @@ const char kDRMSalt[] = "settings.privacy.drm_salt";
 // A boolean pref that enables the (private) pepper GetDeviceID() call.
 const char kEnableDRM[] = "settings.privacy.drm_enabled";
 
+// A boolean pref that signals if the ActivityLog extension is installed and
+// enabled.
+const char kActivityLogExtensionEnabled[] =
+    "activity_log.activity_log_extension_enabled";
+
 }  // namespace prefs