Add missing newline in chrome_browser.gypi.

Add missing newline in chrome_browser.gypi.

The CL https://codereview.chromium.org/415343002/ accidentally
introduced new files in //chrome/chrome_browser.gypi without
adding a newline.

This CL just cleans up the style of the .gypi.

BUG=383630
Committed: https://crrev.com/bfa75d815bafe31a3f61d3d00dd8c81a1913208e
Cr-Commit-Position: refs/heads/master@{#293204}

[nyquist, 2014-09-03 17:55:11]

nyquist@chromium.org changed reviewers:
+ thestig@chromium.org

[nyquist, 2014-09-03 17:55:11]

thestig: PTAL

[robliao, 2014-09-03 18:08:05]

robliao@chromium.org changed reviewers:
+ robliao@chromium.org

[robliao, 2014-09-03 18:08:05]

lgtm

[Lei Zhang, 2014-09-03 18:10:43]

lgtm

[nyquist, 2014-09-03 18:24:45]

The CQ bit was checked by nyquist@chromium.org

[commit-bot: I haz the power, 2014-09-03 18:26:07]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/nyquist@chromium.org/533173003/1

[commit-bot: I haz the power, 2014-09-03 19:32:56]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_chromium_chromeos_rel_swarming on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_rel_swarming on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  mac_chromium_compile_dbg on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)
  mac_chromium_rel_swarming on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[commit-bot: I haz the power, 2014-09-03 19:37:43]

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

[commit-bot: I haz the power, 2014-09-03 19:37:44]

Try jobs failed on following builders:
  mac_chromium_rel_swarming on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[Lei Zhang, 2014-09-03 20:17:51]

The CQ bit was checked by thestig@chromium.org

[commit-bot: I haz the power, 2014-09-03 20:20:18]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/nyquist@chromium.org/533173003/1

[commit-bot: I haz the power, 2014-09-03 21:47:39]

Committed patchset #1 (id:1) as 50458552660a212b9618a441835cec45c00ad4b9

[commit-bot: I haz the power, 2014-09-10 03:28:01]

Patchset 1 (id:??) landed as
https://crrev.com/bfa75d815bafe31a3f61d3d00dd8c81a1913208e
Cr-Commit-Position: refs/heads/master@{#293204}