gn: simplify generated extensions API template.

gn: simplify generated extensions API template.

This simplifies the template a bit by removing the
(now implied) hard_dep values and using the new
get_target_outputs function in lieu of
process_file_template.

BUG=None
TBR=yoz

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=269133

[Ken Rockot(use gerrit already), 2014-05-07 05:51:31]

ptal

[brettw, 2014-05-07 17:30:38]

nice, lgtm

[Ken Rockot(use gerrit already), 2014-05-07 18:03:23]

The CQ bit was checked by rockot@chromium.org

[commit-bot: I haz the power, 2014-05-07 18:08:19]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/rockot@chromium.org/271613002/1

[commit-bot: I haz the power, 2014-05-07 21:51:33]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium
  win_chromium_x64_rel on tryserver.chromium

[commit-bot: I haz the power, 2014-05-08 01:17:40]

FYI, CQ is re-trying this CL (attempt #2).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium

[commit-bot: I haz the power, 2014-05-08 02:50:45]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium

[commit-bot: I haz the power, 2014-05-08 03:22:46]

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

[commit-bot: I haz the power, 2014-05-08 03:22:46]

Try jobs failed on following builders:
  android_dbg_triggered_tests on tryserver.chromium

[Ken Rockot(use gerrit already), 2014-05-08 16:00:23]

The CQ bit was checked by rockot@chromium.org

[commit-bot: I haz the power, 2014-05-08 16:02:25]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/rockot@chromium.org/271613002/1

[commit-bot: I haz the power, 2014-05-09 01:32:13]

Change committed as 269133