r24097 disabled text zooming on most of the web inspector (fix for bug 10752). This did not however, disable text zooming for source views which still resize. That should probably be fixed (possibly deserves its own bug). We should either make the whole inspector play nicer with text zooming and reenable it or pass the text zoom request onto the inspected webview as the current behavior doesn't seem very good.
<rdar://problem/5712844>
Text/Page zome has no affect in the Inspector any more.