Remove trailing whitespace with URL in make_url at once
fix unit of clientrect &
add width,height test in src/test/html/content/test_getBoundingClientRect.html
auto merge of #1451 : ksh8281/servo/fix_unit_of_clientrect, r=jdm

this pr fixes #1076
auto merge of #1446 : sammykim/servo/load_url, r=SimonSapin

1. We must remove trailing whitespace. It makes crash.