[Gin] Add a warning about potential memory leak for CreateFunctionTemplate

[Gin] Add a warning about potential memory leak for CreateFunctionTemplate

Whether to actually cache the template depends on the use case, so only
adding a warning in a comment.

BUG=463487
Committed: https://crrev.com/098ba6f53d540c16953724a027a1e05dcd20ecc8
Cr-Commit-Position: refs/heads/master@{#318889}

[mnaganov (inactive), 2015-03-03 13:43:29]

mnaganov@chromium.org changed reviewers:
+ aa@google.com, jochen@chromium.org

[jochen (gone - plz use gerrit), 2015-03-03 13:56:28]

lgtm

[mnaganov (inactive), 2015-03-03 15:22:12]

The CQ bit was checked by mnaganov@chromium.org

[commit-bot: I haz the power, 2015-03-03 15:23:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/974863002/1

[commit-bot: I haz the power, 2015-03-03 16:34:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-03 16:36:27]

Patchset 1 (id:??) landed as
https://crrev.com/098ba6f53d540c16953724a027a1e05dcd20ecc8
Cr-Commit-Position: refs/heads/master@{#318889}