Minor IndexedDB refactorings.

third_party/WebKit/Source/modules/indexeddb/IDBMetadata.h

Index: third_party/WebKit/Source/modules/indexeddb/IDBMetadata.h
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBMetadata.h b/third_party/WebKit/Source/modules/indexeddb/IDBMetadata.h
index e293d3ac55b2edd84e169144f52439e1c1b129aa..74f1bd80d1bc4b136e5344aa07771728eb826dd0 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBMetadata.h
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBMetadata.h
@@ -53,7 +53,7 @@ struct IDBIndexMetadata {
     bool unique;
     bool multiEntry;
 
-    static const int64_t InvalidId = -1;
+    static constexpr int64_t InvalidId = -1;
 };
 
 struct IDBObjectStoreMetadata {
@@ -73,7 +73,7 @@ struct IDBObjectStoreMetadata {
     bool autoIncrement;
     int64_t maxIndexId;
 
-    static const int64_t InvalidId = -1;
+    static constexpr int64_t InvalidId = -1;
 
     typedef HashMap<int64_t, IDBIndexMetadata> IndexMap;
     IndexMap indexes;