linux: don't try to create plugin container if view_ is NULL
linux: don't try to create plugin container if view_ is NULL

This can only happen for extensions with delay-initialized RenderWidgetHost.

BUG=28715

Review URL: http://codereview.chromium.org/450029

git-svn-id: http://src.chromium.org/svn/trunk/src@33434 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 9e5440fc18e6815cd1634e1acfc9dc69770d9b44
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