Revert of [AiS] Merge answers into highest-scoring result

Revert of [AiS] Merge answers into highest-scoring result (patchset #6 id:100001 of https://codereview.chromium.org/584653004/)

Reason for revert:
The new tests are flaky:
http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20%283%29/builds/7944

Original issue's description:
> [AiS] Merge answers into highest-scoring result
>
> Answer contents and type must always be copied to the highest-scoring
> suggestion, to ensure answers are not lost due to suggestion
> deduplication.
>
> BUG=415836
> R=mpearson
>
> Committed: https://crrev.com/978a4bf4a3be714950ed265660bd9566f7abd922
> Cr-Commit-Position: refs/heads/master@{#296520}

TBR=mpearson@google.com,mpearson@chromium.org,newt@chromium.org,groby@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=415836
Committed: https://crrev.com/ba5d32190d4f056b11738b050b94895b655c52f7
Cr-Commit-Position: refs/heads/master@{#296555}

[jiayl, 2014-09-24 23:04:03]

Created Revert of [AiS] Merge answers into highest-scoring result

[commit-bot: I haz the power, 2014-09-24 23:05:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/598253002/1

[commit-bot: I haz the power, 2014-09-24 23:07:15]

Committed patchset #1 (id:1) as f54fe5bad0f8d3b6cc7bb5e3817bc9da2a68aa48

[commit-bot: I haz the power, 2014-09-24 23:08:12]

Patchset 1 (id:??) landed as
https://crrev.com/ba5d32190d4f056b11738b050b94895b655c52f7
Cr-Commit-Position: refs/heads/master@{#296555}

[jiayl, 2014-09-24 23:22:03]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/599273002/ by jiayl@chromium.org.

The reason for reverting is: Broken GN build:
http://build.chromium.org/p/chromium.linux/builders/Linux%20GN%20%28dbg%29/bu....