Fix painting problems that came up after manually calling RedrawWindow on child windows so that we can paint out of process HWNDs asynchronously.  The problem is that the function parameter that was passed in to the first RedrawWindow was modified since it's a member variable of the class.  OnPaint would empty the rectangle, and so nothing was painted for children.
Fix painting problems that came up after manually calling RedrawWindow on child windows so that we can paint out of process HWNDs asynchronously.  The problem is that the function parameter that was passed in to the first RedrawWindow was modified since it's a member variable of the class.  OnPaint would empty the rectangle, and so nothing was painted for children.

BUG=12010
TEST=unsafe downloads should have their save/discard buttons painted normally.
Review URL: http://codereview.chromium.org/115545

git-svn-id: http://src.chromium.org/svn/trunk/src@16446 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 69a66fd16bdb2c95557b5df18297870bad863bae
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser