Revert of Refactor compilation dependency handling.

Revert of Refactor compilation dependency handling. (patchset #4 id:60001 of https://codereview.chromium.org/1095433002/)

Reason for revert:
[Sheriff] Causes crashes in laout tests:
http://build.chromium.org/p/client.v8/builders/V8-Blink%20Linux%2064%20%28dbg%29/builds/2543

Extra bisect run:
http://build.chromium.org/p/client.v8/builders/V8-Blink%20Linux%2064%20%28dbg%29/builds/2548

Original issue's description:
> Refactor compilation dependency handling.
>
> Extract a new data structure CompilationDependencies and move (most) logic there.
>
> R=mstarzinger@chromium.org,verwaest@chromium.org
> BUG=
>
> Committed: https://crrev.com/b882479f1c84a48961b8aec81fa1bb1225034784
> Cr-Commit-Position: refs/heads/master@{#27892}

TBR=mstarzinger@chromium.org,verwaest@chromium.org,titzer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/e3c2ba776a1796b8ea9ddc651cd5f1f0edde48c5
Cr-Commit-Position: refs/heads/master@{#27904}

[Michael Achenbach, 2015-04-17 07:46:54]

Created Revert of Refactor compilation dependency handling.

[commit-bot: I haz the power, 2015-04-17 07:47:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1093783002/1

[commit-bot: I haz the power, 2015-04-17 07:47:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-17 07:47:33]

Patchset 1 (id:??) landed as
https://crrev.com/e3c2ba776a1796b8ea9ddc651cd5f1f0edde48c5
Cr-Commit-Position: refs/heads/master@{#27904}