Rewrite performed with this command:
sed -i '' 's_code.google.com/p/go\._golang.org/x/_g' \
$(grep -lr 'code.google.com/p/go.' *)
LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/170920043
Nodes in a strongly connected component (which includes most
stdlib packages) appear in results of both "forward" and
"reverse" searches from any other node in the same SCC.
LGTM=sameer
R=sameer
CC=golang-codereviews, gri
https://golang.org/cl/136470044
Refactoring tools can use this to determine an upper bound on
the set of packages potentially affected by a refactoring.
LGTM=gri
R=gri
CC=golang-codereviews
https://golang.org/cl/141310043
