Revert of Disable support for swapped out RenderFrame(Host) and add instrumentation

Revert of Disable support for swapped out RenderFrame(Host) and add instrumentation (patchset #2 id:20001 of https://codereview.chromium.org/1397323004/ )

Reason for revert:
There are enough dumps at this time and this CL is no longer needed.

Original issue's description:
> Disable support for swapped out RenderFrame(Host) and add instrumentation
>
> This CL is aiming to collect information about cases where the
> FocusController's focused frame is set to a RemoteFrame. This is the root
> cause of the crash in https://crbug.com/541578.
>
> BUG=541578, 357747
>
> Committed: https://crrev.com/144cbce186be2afe854b7c5d9ba6780fbaea07b8
> Cr-Commit-Position: refs/heads/master@{#353847}

TBR=dcheng@chromium.org,rsesek@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=541578, 357747
Committed: https://crrev.com/7155b70cdb939ebb07013eebfeaec23ad3ce2f15
Cr-Commit-Position: refs/heads/master@{#354013}

[nasko, 2015-10-14 13:37:27]

Created Revert of Disable support for swapped out RenderFrame(Host) and add
instrumentation

[commit-bot: I haz the power, 2015-10-14 13:38:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1403613004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1403613004/1

[commit-bot: I haz the power, 2015-10-14 13:39:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-14 13:40:45]

Patchset 1 (id:??) landed as
https://crrev.com/7155b70cdb939ebb07013eebfeaec23ad3ce2f15
Cr-Commit-Position: refs/heads/master@{#354013}

[dcheng, 2015-10-14 16:39:21]

lgtm