See http://cgit.freedesktop.org/libreoffice/core/commit/?id=79b5bf5cab66efbec81f9eac4e023af4f5f5141f for an example. connectivity/source/drivers/postgresql/* is the first obvious target. If you find any others, you can convert them, too.
Everywhere a class inherits directly from XFooBar (a public UNO API interface), instead of through some helper, this cleanup applies.
If you tackle this EasyHack, do it directly in the new style that is recommended by EasyHack bug 88206
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