Fix the screen bounds calculation of windowless widgets.  Only windowed parent widgets' allocation should be taken into account when calculating the widget screen bounds.
Fix the screen bounds calculation of windowless widgets.  Only windowed parent widgets' allocation should be taken into account when calculating the widget screen bounds.

BUG=none
TEST=Open a browser and set the frame to custom.  Drag tabs around.  They should not be offset vertically.
Review URL: http://codereview.chromium.org/147065

git-svn-id: http://src.chromium.org/svn/trunk/src@19139 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 2baf97ebfbbdca646cd7e7c094be80464ddc74eb
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