Bookmark manager: Fix issue where we cache the height of a list item.
Bookmark manager: Fix issue where we cache the height of a list item.

This caused us to select the wrong item under some circumstances when the user zooms the page.

BUG=49492
TEST=Go to bookmark manager. Select a folder with 8 or more items. Zoom twice. Select the 8th item using the mouse.

Review URL: http://codereview.chromium.org/5278008

git-svn-id: http://src.chromium.org/svn/trunk/src@67549 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c2438b327eab42438baee9c47e60c1f889451d18
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