IndexedDB: Preparatory patch for https://bugs.webkit.org/show_bug.cgi?id=50674

chrome/common/indexed_db_key.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/common/indexed_db_key.h"
 
 #include "base/logging.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebString.h"
 
 using WebKit::WebIDBKey;
@@ skipping 25 matching lines @@
 
 void IndexedDBKey::Set(int32_t number) {
   type_ = WebIDBKey::NumberType;
   number_ = number;
 }
 
 void IndexedDBKey::Set(const WebIDBKey& key) {
   type_ = key.type();
   string_ = key.type() == WebIDBKey::StringType ?
                 static_cast<string16>(key.string()) : string16();
-  number_ = key.type() == WebIDBKey::NumberType ? key.number() : 0;
+  number_ = key.type() == WebIDBKey::NumberType ?
+      static_cast<int32_t>(key.number()) : 0;
 }
 
 IndexedDBKey::operator WebIDBKey() const {
   switch (type_) {
     case WebIDBKey::NullType:
       return WebIDBKey::createNull();
     case WebIDBKey::StringType:
       return WebIDBKey(string_);
     case WebIDBKey::NumberType:
       return WebIDBKey(number_);
     case WebIDBKey::InvalidType:
       return WebIDBKey::createInvalid();
   }
   NOTREACHED();
   return WebIDBKey::createInvalid();
 }