Make drag-to-activate session history dropdowns less sensitive. Patch from viettrunglu@gmail.com BUG=19273 TEST=Make your mouse really sensitive; see if you can accidentally activate the back/forward history dropdowns.
Make drag-to-activate session history dropdowns less sensitive. Patch from viettrunglu@gmail.com
BUG=19273
TEST=Make your mouse really sensitive; see if you can accidentally activate the
back/forward history dropdowns.

git-svn-id: http://src.chromium.org/svn/trunk/src@23334 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: ec0a94bcb0d8ce74ca1d3ee7b644382fc7fdb4a6
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