Fix GN midl template for input/output checking

Fix GN midl template for input/output checking

An upcoming version of GN will check that inputs to scripts are generated by public dependencies of the script. The MIDL rule is the only failing part of the Windows build.

Committed: https://crrev.com/bf622f689a0f60eb57f0d634afbb3dce8b523c80
Cr-Commit-Position: refs/heads/master@{#332450}

[brettw, 2015-06-02 18:22:40]

brettw@chromium.org changed reviewers:
+ scottmg@chromium.org

[brettw, 2015-06-02 18:22:45]

The CQ bit was checked by brettw@chromium.org to run a CQ dry run

[scottmg, 2015-06-02 18:24:28]

lgtm

[commit-bot: I haz the power, 2015-06-02 18:25:25]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1152743004/1

[commit-bot: I haz the power, 2015-06-02 19:10:54]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-02 19:10:55]

Dry run: This issue passed the CQ dry run.

[brettw, 2015-06-02 19:11:36]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-06-02 19:15:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1152743004/1

[commit-bot: I haz the power, 2015-06-02 19:50:58]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-02 19:52:23]

Patchset 1 (id:??) landed as
https://crrev.com/bf622f689a0f60eb57f0d634afbb3dce8b523c80
Cr-Commit-Position: refs/heads/master@{#332450}