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

WebIDBKey::number() will be changed to return a double.
Cast this to int explicitly to avoid warnings in the mean time (esp. on Visual
Studio).

BUG=65619
TEST=none

Review URL: http://codereview.chromium.org/5727002

git-svn-id: http://src.chromium.org/svn/trunk/src@68835 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 7fde5c6832c627fecba0bf70f36d26d345b65938
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser