IndexedDB: Make DOMException messages more useful.

Source/modules/indexeddb/IDBDatabase.h

Index: Source/modules/indexeddb/IDBDatabase.h
diff --git a/Source/modules/indexeddb/IDBDatabase.h b/Source/modules/indexeddb/IDBDatabase.h
index b68812421818712d8eaa87c6a952853b2b958f3a..c98e172a5db2fd14e704b9741776b036b9b33de5 100644
--- a/Source/modules/indexeddb/IDBDatabase.h
+++ b/Source/modules/indexeddb/IDBDatabase.h
@@ -107,7 +107,18 @@ public:
 
     static int64_t nextTransactionId();
 
-    static const char notFoundErrorMessage[];
+    static const char indexDeletedErrorMessage[];
+    static const char isKeyCursorErrorMessage[];
+    static const char noKeyOrKeyRangeErrorMessage[];
+    static const char noSuchIndexErrorMessage[];
+    static const char noSuchObjectStoreErrorMessage[];
+    static const char notGotValueErrorMessage[];
+    static const char notValidKeyErrorMessage[];
+    static const char notVersionChangeTransactionErrorMessage[];
+    static const char objectStoreDeletedErrorMessage[];
+    static const char requestNotFinishedErrorMessage[];
+    static const char sourceDeletedErrorMessage[];
+    static const char transactionFinishedErrorMessage[];
 
     using RefCounted<IDBDatabase>::ref;
     using RefCounted<IDBDatabase>::deref;