drive: Stop using GData WAPI formatted JSON file in file_system_apitest_chromeos.cc

drive: Stop using GData WAPI formatted JSON file in file_system_apitest_chromeos.cc

Loading empty_feed.json is meaningless now.
LoadAccountMetadataForWapi() is deprecated and has no effect essentially.

BUG=334544
TEST=browser_tests

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=261414

[hashimoto, 2014-04-02 07:40:53]

This change depends on https://codereview.chromium.org/221773002/ ("Deprecate
FakeDriveService::LoadAccountMetadataForWapi")

[kinaba, 2014-04-02 07:41:33]

lgtm

[hashimoto, 2014-04-02 07:42:06]

benwells@, could you take a look at this change as an owner?

[benwells, 2014-04-02 08:20:01]

lgtm

[hashimoto, 2014-04-03 11:58:13]

The CQ bit was checked by hashimoto@chromium.org

[commit-bot: I haz the power, 2014-04-03 11:58:35]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hashimoto@chromium.org/221853002/1

[commit-bot: I haz the power, 2014-04-03 12:43:43]

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

[commit-bot: I haz the power, 2014-04-03 12:43:43]

Retried try job too often on ios_rel_device_ninja for step(s) compile
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=ios_rel_de...

[hashimoto, 2014-04-03 15:12:08]

The CQ bit was checked by hashimoto@chromium.org

[commit-bot: I haz the power, 2014-04-03 15:13:17]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hashimoto@chromium.org/221853002/1

[commit-bot: I haz the power, 2014-04-03 15:37:11]

Change committed as 261414