Qt_4.8_Integration #1683: SUCCESS
Tested changes (refs/builds/4.8_1384795959):
http://codereview.qt-project.org/71601 [PS2] - Fix MinGW-warnings about narrowing/invalid conversions.
http://codereview.qt-project.org/71600 [PS1] - MinGW: Fix warnings about assigned but not used variables.