Revert of Remove tools/safely-roll-blink now that tools/safely-roll-deps is stable.

Revert of Remove tools/safely-roll-blink now that tools/safely-roll-deps is stable. (https://codereview.chromium.org/291333007/)

Reason for revert:
This removed the wrong file (safely-roll-deps instead of safely-roll-blink).  Now Skia's AutoRoll Bot is broken.

Original issue's description:
> Remove tools/safely-roll-blink now that tools/safely-roll-deps is stable.
> 
> "tools/safely-roll-deps /src blink"
> is the replacemnt syntax.  No need to keep dead code around.
> 
> BUG=242461
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272347

TBR=maruel@google.com,borenet@chromium.org,eseidel@chromium.org,blink-deps-roller@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=242461
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272518

[borenet, 2014-05-23 13:20:07]

Created Revert of Remove tools/safely-roll-blink now that tools/safely-roll-deps
is stable.

[commit-bot: I haz the power, 2014-05-23 13:21:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/borenet@google.com/294163012/1

[commit-bot: I haz the power, 2014-05-23 13:21:05]

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

[commit-bot: I haz the power, 2014-05-23 13:21:06]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[M-A Ruel, 2014-05-23 14:08:20]

On 2014/05/23 13:21:06, I haz the power (commit-bot) wrote:
> No LGTM from a valid reviewer yet. Only full committers are accepted.
> Even if an LGTM may have been provided, it was from a non-committer or
> a provisional committer, _not_ a full super star committer.
> See http://www.chromium.org/getting-involved/become-a-committer
> Note that this has nothing to do with OWNERS files.

lgtm

[borenet, 2014-05-23 14:09:58]

The CQ bit was checked by borenet@google.com

[commit-bot: I haz the power, 2014-05-23 14:10:33]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/borenet@google.com/294163012/1

[commit-bot: I haz the power, 2014-05-23 14:11:46]

Change committed as 272518