Revert of [Suggestions] Move ImageManager to the component

Revert of [Suggestions] Move ImageManager to the component (patchset #6 id:220001 of https://codereview.chromium.org/543753002/)

Reason for revert:
One of the new unit tests failed with uninit memory access: http://build.chromium.org/p/chromium.memory.fyi/builders/Chromium%20OS%20%28valgrind%29%282%29/builds/43137/

Original issue's description:
> [Suggestions] Move ImageManager to the component
>
> Keeps the fetcher functionality as ImageFetcherImpl in chrome/browser/search/suggestions.
>
> BUG=387751
> TBR=blundell
> TEST=ImageManagerTest,ImageFetcherBrowserTest
>
> Committed: https://crrev.com/5a25f30080dd57d200679546c970d70f2247def9
> Cr-Commit-Position: refs/heads/master@{#296503}

TBR=huangs@chromium.org,blundell@chromium.org,mathp@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=387751
Committed: https://crrev.com/da4b14f0affb40a6c4d3452a148f2383a48eefce
Cr-Commit-Position: refs/heads/master@{#296553}

[Lei Zhang, 2014-09-24 23:00:36]

Created Revert of [Suggestions] Move ImageManager to the component

[commit-bot: I haz the power, 2014-09-24 23:02:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/600203002/1

[commit-bot: I haz the power, 2014-09-24 23:03:24]

Committed patchset #1 (id:1) as d2089ea93b116a8daa50a11563691e3c26e5b991

[commit-bot: I haz the power, 2014-09-24 23:04:06]

Patchset 1 (id:??) landed as
https://crrev.com/da4b14f0affb40a6c4d3452a148f2383a48eefce
Cr-Commit-Position: refs/heads/master@{#296553}