Initialize source field of PolicyMap::Entry

components/policy/core/common/policy_map.h

Index: components/policy/core/common/policy_map.h
diff --git a/components/policy/core/common/policy_map.h b/components/policy/core/common/policy_map.h
index 0eb7839f6e3f4d5fdd8d0b05d7c5b19df1873201..192c2557d6bdba5daad939bb921288aa09d8d924 100644
--- a/components/policy/core/common/policy_map.h
+++ b/components/policy/core/common/policy_map.h
@@ -27,13 +27,13 @@ class POLICY_EXPORT PolicyMap {
   // Each policy maps to an Entry which keeps the policy value as well as other
   // relevant data about the policy.
   struct POLICY_EXPORT Entry {
-    PolicyLevel level;
-    PolicyScope scope;
+    PolicyLevel level = POLICY_LEVEL_RECOMMENDED;
+    PolicyScope scope = POLICY_SCOPE_USER;
     std::unique_ptr<base::Value> value;
     std::unique_ptr<ExternalDataFetcher> external_data_fetcher;
 
     // For debugging and displaying only. Set by provider delivering the policy.
-    PolicySource source;
+    PolicySource source = POLICY_SOURCE_ENTERPRISE_DEFAULT;
 
     Entry();
     ~Entry();