UnitTests: Cleanup unit tests

There was still unneeded PrintTo functions and gtest includes.
It is now possible to use MockFunction for callbacks.

Change-Id: Ie5875c3697069a37b48c2f2022f1f8c21f1c794f
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/libs/sqlite/utf8string.cpp

@@ -39,11 +39,6 @@ QDebug operator<<(QDebug debug, const Utf8String &text)
     return debug;
 }
 
-void PrintTo(const Utf8String &text, ::std::ostream* os)
-{
-    *os << "\"" << text.toByteArray().data() << "\"";
-}
-
 std::ostream& operator<<(std::ostream &os, const Utf8String &utf8String)
 {
     using std::ostream;