SEC Seen Making Google IPO Effective  WASHINGTON (Reuters) - The U.S. Securities and Exchange  Commission is expected to declare the initial public offering  registration of Google Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GOOG.OQ target=/stocks/quickinfo/fullquote"&gt;GOOG.OQ&lt;/A&gt; effective after 4 p.m.  (2000 GMT), sources familiar with the matter said on Wednesday.