Attempt to fix all.gyp again, take #2.

Attempt to fix all.gyp again, take #2.

The prior fix -- #317907 -- used "iOS" instead of "ios". 

The initial change disabled the "blink_tests" target, and also had a redundant conditions block.

My first attempt at a fix fixed blink_tests, but typo'ed "iOS" instead of "ios", causing the iOS bots to pick up stuff that couldn't build, and fail.

TBR=brettw@chromium.org
NOTRY=true
NOTREECHECKS=true

Committed: https://chromium.googlesource.com/chromium/src/+/2f69645f3a92b8386435a17b13ff3b9e52bf01c8

[Dirk Pranke, 2015-02-24 23:10:27]

The CQ bit was checked by dpranke@chromium.org

[commit-bot: I haz the power, 2015-02-24 23:11:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/953803004/1

[commit-bot: I haz the power, 2015-02-24 23:24:48]

Patchset 1 (id:??) landed as
https://crrev.com/2f69645f3a92b8386435a17b13ff3b9e52bf01c8
Cr-Commit-Position: refs/heads/master@{#317914}

[Dirk Pranke, 2015-02-24 23:24:58]

Committed patchset #1 (id:1) manually as
2f69645f3a92b8386435a17b13ff3b9e52bf01c8 (tree was closed).