IndexedDB: Fix null ptr crash in IDBCursor::value().

third_party/WebKit/Source/bindings/modules/v8/V8BindingForModules.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 294 matching lines @@
 
     ASSERT(keyPath.type() == IDBKeyPath::StringType);
     return createIDBKeyFromValueAndKeyPath(isolate, value, keyPath.string(), exceptionState, allowExperimentalTypes);
 }
 
 // Deserialize just the value data & blobInfo from the given IDBValue.
 // Does not deserialize the key & keypath.
 static v8::Local<v8::Value> deserializeIDBValueData(v8::Isolate* isolate, const IDBValue* value)
 {
     ASSERT(isolate->InContext());
-    if (!value || value->isNull())
+    if (value->isNull())
         return v8::Null(isolate);
 
     const SharedBuffer* valueData = value->data();
     RefPtr<SerializedScriptValue> serializedValue = SerializedScriptValueFactory::instance().createFromWireBytes(valueData->data(), valueData->size());
     return serializedValue->deserialize(isolate, nullptr, value->blobInfo());
 }
 
 // Deserialize the entire IDBValue (injecting key & keypath if present).
 static v8::Local<v8::Value> deserializeIDBValue(v8::Isolate* isolate, v8::Local<v8::Object> creationContext, const IDBValue* value)
 {
     ASSERT(isolate->InContext());
-    if (!value || value->isNull())
+    if (value->isNull())
         return v8::Null(isolate);
 
     v8::Local<v8::Value> v8Value = deserializeIDBValueData(isolate, value);
     if (value->primaryKey()) {
         v8::Local<v8::Value> key = toV8(value->primaryKey(), creationContext, isolate);
         if (key.IsEmpty())
             return v8::Local<v8::Value>();
         bool injected = injectV8KeyIntoV8Value(isolate, key, v8Value, value->keyPath());
         ASSERT_UNUSED(injected, injected);
     }
@@ skipping 173 matching lines @@
     ASSERT(!exceptionState.hadException());
     if (expectedKey && expectedKey->isEqual(value->primaryKey()))
         return;
 
     bool injected = injectV8KeyIntoV8Value(isolate, keyValue.v8Value(), scriptValue.v8Value(), value->keyPath());
     ASSERT_UNUSED(injected, injected);
 }
 #endif
 
 } // namespace blink