Include plus.google.com and plus.sandbox.google.com in the NaCl whitelist.
We need these hosts whitelisted to make Hangouts work properly.
See the comments in the original CL that extended the whitelist: https://chromiumcodereview.appspot.com/
23466009#msg9
Also extend the manifest list to filesystem:https://... so we can load a cached plugin.
NOTRY=true
BUG=
Review URL: https://codereview.chromium.org/
99203009
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240870 0039d316-1c4b-4281-b951-d872f2087c98