Drag and drop for extension in RTL wasn't working properly. ExtensionShelf::ToolstripAtX would never find a toolstrip for any value of x (or would find wrong one).
Drag and drop for extension in RTL wasn't working properly.
ExtensionShelf::ToolstripAtX would never find a toolstrip for any value of x (or would find wrong one).


BUG=11880
TEST=Load chrome with --lang=he, add 2-3 extensions and try dragging and switching their positions. It should work as LTR.

Review URL: http://codereview.chromium.org/204015

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@26188 0039d316-1c4b-4281-b951-d872f2087c98

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