Change X-UA-Compatible from <meta> tag to HTTP header

Derk-Jan Hartman suggested this to remove a HTML validation error.  As he
noted, the HTTP header is also more effective, since it works on
intranets, and is not sensitive to ordering issues within the <head>.

See http://stackoverflow.com/questions/6156639 .

Bug: 62885
Change-Id: I2214abcb1badbbaca48427a31d1218c9db9a6af7
Merge "Change X-UA-Compatible from <meta> tag to HTTP header"