Templating::getContent() should return safe-to-display content

The result could be used directly for display purpose.  With this
change, we don't need to check before using the result
from Templating::getContent(), eg:
if ( allowed to view ) {
     escape the result
} else {
     don't escape the result
}

Change-Id: Iee01cacc8fc1782b4eafe96397699ae73eb1aaa3
Merge "Templating::getContent() should return safe-to-display content"