testsuite: remove incorrect section of 2 test cases. (Also, &const is disappearing.)

Fixes #7304.

src/test/run-pass/coerce-reborrow-imm-vec-arg.rs

@@ -12,10 +12,4 @@ fn sum_imm(y: &[int]) -> int {
     sum(y)
 }
 
-/* FIXME #7304
-fn sum_const(y: &const [int]) -> int {
-    sum(y)
-}
-*/
-
 pub fn main() {}

src/test/run-pass/coerce-reborrow-imm-vec-rcvr.rs

@@ -1,9 +1,3 @@
-/* FIXME #7302
-fn foo(v: &const [uint]) -> ~[uint] {
-    v.to_owned()
-}
-*/
-
 fn bar(v: &mut [uint]) -> ~[uint] {
     v.to_owned()
 }
@@ -14,7 +8,6 @@ fn bip(v: &[uint]) -> ~[uint] {
 
 pub fn main() {
     let mut the_vec = ~[1u, 2, 3, 100];
-//    assert_eq!(the_vec.clone(), foo(the_vec));
     assert_eq!(the_vec.clone(), bar(the_vec));
     assert_eq!(the_vec.clone(), bip(the_vec));
 }