ACTION-515 Propose tightened text in 7.2

We discovered we were unhappy with how nebulous the text in 7.2 about user 
confusion is. Here is my proposal for changing it based on that 
discussion:

"Web User Agents MUST NOT communicate trust information using user 
interface elements which can be mimicked within chrome under the control 
of web content. Site-controlled content (e.g. page title, favicon) MAY be 
hosted in chrome, but this content MUST NOT be displayed in a manner that 
confuses hosted content and chrome indicators, by allowing that content to 
either mimic chrome indicators in a position close to them "

The text it would replace: 
"Web User Agents MUST NOT communicate trust information using user 
interface elements which can be mimicked within chrome under the control 
of web content. Site-controlled content (e.g. page title, favicon) MAY be 
hosted in chrome, but this content MUST NOT be displayed in a manner that 
confuses hosted content and chrome indicators "