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: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@33434 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser