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: de016e52bd170d2d4f2344f9bf92d50478b649e0@19139 0039d316-1c4b-4281-b951-d872f2087c98

ropik/chromium,adobe/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,adobe/chromium,Crystalnix/house-of-life-chromium,adobe/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,ropik/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,adobe/chromium,Crystalnix/house-of-life-chromium,adobe/chromium,ropik/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,adobe/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,adobe/chromium,yitian134/chromium