Convert "return local_var.Pass();" to "return local_var;".

Convert "return local_var.Pass();" to "return local_var;".

(Except where not possible, which is relatively infrequent.)

Directories converted include: //mojo/..., //services/..., //shell/...
(//apps and //examples were already "clean").

R=jamesr@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/b792c80e04ce40c629585c463803da9b89ccc715

[jamesr, 2015-10-27 18:20:38]

lgtm

[viettrungluu, 2015-10-27 18:27:39]

Committed patchset #1 (id:1) manually as
b792c80e04ce40c629585c463803da9b89ccc715 (presubmit successful).