Add report URL to safe search API functionality.

chrome/common/chrome_features.cc

Index: chrome/common/chrome_features.cc
diff --git a/chrome/common/chrome_features.cc b/chrome/common/chrome_features.cc
index e1c558bcde2c91b16cc46409eb3732333673bb01..06827049fc3fae14f466e1d80928232289fa2fc9 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -27,6 +27,9 @@ const base::Feature kMaterialDesignHistoryFeature {
   "MaterialDesignHistory", base::FEATURE_DISABLED_BY_DEFAULT
 };
 
+const base::Feature kSafeSearchUrlReporting{"SafeSearchUrlReporting",
+                                            base::FEATURE_DISABLED_BY_DEFAULT};
+
 #if defined(OS_CHROMEOS)
 // Runtime flag that indicates whether this leak detector should be enabled in
 // the current instance of Chrome.