Bookmark bar menu/folder button text is left-aligned, not centered.

Bookmark bar menu/folder maximum window width is now 1000, not 150.

High cosmetic impact.

BUG=36487, 17608

TEST=\
1) Add bookmarks on the bar with small (e.g. 'x') and big titles.
Make sure all looks OK (e.g. small ones are small.)
2) Add bookmarks in a folder.
Make sure text is left aligned on the menus.
3) Add bookmarks in a folder with long names (e.g. 100 characters).
Make sure folder/menus are now much wider.
4) Add bookmarks in a folder with mega long names (e.g. 4000 characters).
Make sure menus have a maximum size of ~1000 pixes (no need to be exact but 'no limit' is fail).
5) In a folder, add a subfolder named 'x' and a bookmark with a REAL long name.
Make sure the "button" (menu item) is the full width of the menu.

Review URL: http://codereview.chromium.org/842005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@41387 0039d316-1c4b-4281-b951-d872f2087c98