Only show the "bookmarks go here" text after we have loaded the bookmark model.  This prevents a "flash" of the text between startp and model load (when model is not empty).
Only show the "bookmarks go here" text after we have loaded the
bookmark model.  This prevents a "flash" of the text between startp
and model load (when model is not empty).

BookmarkBarToolbarView nib change:
The "width based tweaker" object (that contains the "Bookmarks go
here" text shown when you have no bookmarks) defaults to NOT
visible.  

BUG=http://crbug.com/43102

TEST=New profile.  Launch chrome.  Make sure you see the "bookmarks go here" text.
Add a bookmark; make sure text goes away.
Delete it; text comes back.
Add a bookmark; text goes away again.  
Restart Chrome a dozen times.  Make sure you never see the text, even for a flash.


Review URL: http://codereview.chromium.org/2825012

git-svn-id: http://src.chromium.org/svn/trunk/src@50366 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a752a1824aafe5baa53871fb943e54482091f67b
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