Revert of Merge duplicate code in invalidation helper.

Revert of Merge duplicate code in invalidation helper. (patchset #2 id:40001 of https://codereview.chromium.org/1310323009/ )

Reason for revert:
Broke gn gen; see e.g. http://build.chromium.org/p/chromium.linux/builders/Linux%20Builder/builds/56707/steps/generate_build_files/logs/stdio

Original issue's description:
> Merge duplicate code in invalidation helper.
>
> There is code duplication in:
>   components/sync_driver/invalidation_helper
>   sync/tools/invalidation_helper
>
> This patch merged those files by removing duplicate code in
> sync/tools/invalidation_helper.
>
> BUG=528259
>
> Committed: https://crrev.com/de7123741b492a12f35a0cbd7b3e36ff3839a3e6
> Cr-Commit-Position: refs/heads/master@{#349849}

TBR=droger@chromium.org,zea@chromium.org,jitendra.ks@samsung.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=528259
Committed: https://crrev.com/506d23f8515077d82f8621b143b6870ce6b55342
Cr-Commit-Position: refs/heads/master@{#349858}

[Peter Kasting, 2015-09-19 07:13:31]

Created Revert of Merge duplicate code in invalidation helper.

[commit-bot: I haz the power, 2015-09-19 07:13:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1357143002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1357143002/1

[commit-bot: I haz the power, 2015-09-19 07:14:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-19 07:15:03]

Patchset 1 (id:??) landed as
https://crrev.com/506d23f8515077d82f8621b143b6870ce6b55342
Cr-Commit-Position: refs/heads/master@{#349858}

[droger, 2015-09-21 07:42:38]

pkasting: Thanks. Do you know by any chance why the CL passed the CQ? Is there a
try bot that we could run to repro the failure?

[Peter Kasting, 2015-09-21 18:21:31]

On 2015/09/21 07:42:38, droger wrote:
> pkasting: Thanks. Do you know by any chance why the CL passed the CQ? Is there
a
> try bot that we could run to repro the failure?

I do not know, sorry.