DevTools: Fix Windows debug_devtools=1 builds

DevTools: Fix Windows debug_devtools=1 builds

This patch eliminates the "Command line too long" errors
when building on Windows in the debug_devtools=1 mode.

Drive-by: Fix GN build after r183969

R=pfeldman, vsevik

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184003

[pfeldman, 2014-10-20 14:51:57]

lgtm

[apavlov, 2014-10-20 14:53:05]

The CQ bit was checked by apavlov@chromium.org

[commit-bot: I haz the power, 2014-10-20 14:53:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/665083002/1

[commit-bot: I haz the power, 2014-10-20 15:07:03]

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

[commit-bot: I haz the power, 2014-10-20 15:07:05]

Try jobs failed on following builders:
  win_blink_compile_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_compile_dbg/bu...)

[apavlov, 2014-10-20 15:29:00]

Patchset #2 (id:20001) has been deleted

[apavlov, 2014-10-20 15:36:40]

The CQ bit was checked by apavlov@chromium.org

[commit-bot: I haz the power, 2014-10-20 15:37:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/665083002/40001

[commit-bot: I haz the power, 2014-10-20 17:09:52]

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

[commit-bot: I haz the power, 2014-10-20 17:09:54]

Try jobs failed on following builders:
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/27746)

[apavlov, 2014-10-20 17:49:23]

The CQ bit was checked by apavlov@chromium.org

[commit-bot: I haz the power, 2014-10-20 17:50:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/665083002/40001

[commit-bot: I haz the power, 2014-10-20 18:56:09]

Committed patchset #2 (id:40001) as 184003