IndexedDB: Throw exception if no valid context in IDBRequest.result.

third_party/WebKit/Source/modules/indexeddb/IDBRequest.cpp

Index: third_party/WebKit/Source/modules/indexeddb/IDBRequest.cpp
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBRequest.cpp b/third_party/WebKit/Source/modules/indexeddb/IDBRequest.cpp
index 87b075a457d29c767b6670981cd79b4e76c8a3b9..c4157b0382229b02758eed4fcb9e22d44ab2dccd 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBRequest.cpp
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBRequest.cpp
@@ -90,11 +90,14 @@ DEFINE_TRACE(IDBRequest)
 ScriptValue IDBRequest::result(ExceptionState& exceptionState)
 {
     if (m_readyState != DONE) {
+        // Must throw if returning an empty value. Message is arbitrary since it will never be seen.
         exceptionState.throwDOMException(InvalidStateError, IDBDatabase::requestNotFinishedErrorMessage);
         return ScriptValue();
     }
-    if (m_contextStopped || !getExecutionContext())
+    if (m_contextStopped || !getExecutionContext()) {
+        exceptionState.throwDOMException(InvalidStateError, IDBDatabase::databaseClosedErrorMessage);
         return ScriptValue();
+    }
     m_resultDirty = false;
     ScriptValue value = ScriptValue::from(m_scriptState.get(), m_result);
     return value;