Remove unused _info on non-debug builds

Otherwise clang generates a warning which is fatal because of
treating warnings as errors.

Change-Id: I47c280edf6b0f8efa5ce24f9e92551304aed15fb
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
Fix Canvas2d.createConicalGradient

The method requires 3 arguments, not 6

Task-number: QTBUG-34718
Change-Id: Ib6c117ba18844acecea3707720c0c88449b50fb6
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>