Reland "Unit test for sync online wallpaper"

Reland "Unit test for sync online wallpaper"

Reland Unit test for sync online wallpaper (https://codereview.chromium.org/618743003/)
It was reverted because failure on linux_chromium_os with this error:
[7412:7412:0930/164710:INFO:CONSOLE(180)] "ReferenceError: Constants is not
defined
    at testSyncOnlineWallpaper
(file:///tmp/run_tha_teste4P5jV/chrome/test/data/chromeos/wallpaper_manager/unit_tests/event_page_unittest.js:24:11)
    at continueTesting (\u003Canonymous>:177:19)
    at runTests (\u003Canonymous>:153:5)
    at \u003Canonymous>:1:51", source:  (180)
../../chrome/browser/chromeos/extensions/wallpaper_manager_browsertest.cc:89:
Failure
Value of: ExecuteWebUIResourceTest(web_contents, empty_libraries)
  Actual: false
Expected: true

BUG=416130
Committed: https://crrev.com/09d4967a8d18931a28bc57f94cf7dfe416d69486
Cr-Commit-Position: refs/heads/master@{#297942}

[bshe, 2014-10-02 19:58:53]

Patchset #2 (id:20001) has been deleted

[bshe, 2014-10-02 20:06:11]

bshe@chromium.org changed reviewers:
+ kevers@chromium.org, maruel@chromium.org

[bshe, 2014-10-02 20:06:11]

+maruel and +kevers for browser_test.isolate file

My CL previous failed on swarming bots and this should fix it. 

Thanks!

[M-A Ruel, 2014-10-02 20:07:57]

browser_tests.isolate lgtm

[kevers, 2014-10-02 20:23:29]

lgtm

[bshe, 2014-10-02 20:46:30]

The CQ bit was checked by bshe@chromium.org

[commit-bot: I haz the power, 2014-10-02 20:48:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/611233004/30001

[bshe, 2014-10-02 22:58:47]

The CQ bit was checked by bshe@chromium.org

[commit-bot: I haz the power, 2014-10-02 23:00:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/611233004/50001

[commit-bot: I haz the power, 2014-10-02 23:13:02]

Committed patchset #3 (id:50001) as 6e59eb2b7cc44e8e61b2b096e2babc564065a48e

[commit-bot: I haz the power, 2014-10-02 23:14:27]

Patchset 3 (id:??) landed as
https://crrev.com/09d4967a8d18931a28bc57f94cf7dfe416d69486
Cr-Commit-Position: refs/heads/master@{#297942}