Mac: Let task manager columns span entire window immediately.
Mac: Let task manager columns span entire window immediately.

BUG=32148
TEST=Open task manager. It should immediately look like it did if you opened it and then resized it by 1px previously.

Review URL: http://codereview.chromium.org/3056036

git-svn-id: http://src.chromium.org/svn/trunk/src@54387 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: b343894d2b174b7df5d99174fbfc0f406187b378
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