Bug 1026893 - mingw fixup.
Bug 1102804 - Fixed -Wparentheses warnings found in mingw build (gfx and widget part). r=jmathies
Bug 1102804 - Fixed -Wparentheses warnings found in mingw build (dom/plugins part). r=aklotz
Bug 1102804 - Fixed -Wparentheses warnings found in mingw build (toolkit part). r=roc