Add some checks to ToolbarView to see what's NULL.
Add some checks to ToolbarView to see what's NULL.

BUG=none
TEST=none


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=78065
Review URL: http://codereview.chromium.org/6683045

git-svn-id: http://src.chromium.org/svn/trunk/src@78421 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: ce2bf5708dc8462309838c395e0a35d72f8837b9
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