Modify DEPS to recurse into third_party/WebKit (Blink) as well.

Modify DEPS to recurse into third_party/WebKit (Blink) as well.

This will allow us to control the versions of the w3c test repos we
depend on through a file in Blink rather than a file in Chromium; this
makes sense since the tests affect Blink, and it makes it far easier
for us to roll in new versions of the w3c repos.

We also merge in the existing test failures from Blink's TestExpectations
files; as part of this change we are moving the test repos from
LayoutTests/w3c to LayoutTests/third_party, and in order to do this move
we need to move the failures for the old location from a blink-controlled file
to a chromium-controlled file.

This is patch 2 of 4 in the process to move things. This patch depends on https://codereview.chromium.org/410803002 .
R=eseidel@chromium.org
BUG=395862
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285146

[eseidel, 2014-07-22 23:42:06]

lgtm

[Dirk Pranke, 2014-07-23 19:50:38]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2014-07-23 19:53:20]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dpranke@chromium.org/412703002/1

[commit-bot: I haz the power, 2014-07-24 03:46:52]

Change committed as 285146