container/heap/heap_test.go: remove container/vector
container/heap/heap_test.go: remove container/vector

R=golang-dev, dsymonds
CC=golang-dev
http://codereview.appspot.com/4919044
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go