Revert of Add check for mismatching item and document sequence numbers.

Revert of Add check for mismatching item and document sequence numbers. (patchset #2 id:20001 of https://codereview.chromium.org/2172123004/ )

Reason for revert:
Reverting this change as it has resulted in much higher number of reports than anticipated. We have enough data to investigate and can reland a modified version if needed.

Original issue's description:
> Add check for mismatching item and document sequence numbers.
>
> When a PageState update is received from the renderer process, it must
> be for the current session history entry. This means that the sequence
> numbers associated with the FrameNavigationEntry should match the ones
> coming from the renderer process.
> This CL is adding explicit check for this and a DumpWithoutCrashing to
> help diagnose what cases can cause a mismatch.
>
> BUG=628677
>
> Committed: https://crrev.com/e3e35c2d36325c10840b60d2a7cb2a7fe1c6cd14
> Cr-Commit-Position: refs/heads/master@{#407316}

TBR=creis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=628677
Committed: https://crrev.com/10a855e46c9e920bcddd65b79f5047e35f1107ae
Cr-Commit-Position: refs/heads/master@{#407893}

[nasko, 2016-07-26 19:00:52]

The CQ bit was checked by nasko@chromium.org

[nasko, 2016-07-26 19:00:52]

Created Revert of Add check for mismatching item and document sequence numbers.

[commit-bot: I haz the power, 2016-07-26 19:01:43]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-26 20:07:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-26 20:10:27]

Description was changed from

==========
Revert of Add check for mismatching item and document sequence numbers.
(patchset #2 id:20001 of https://codereview.chromium.org/2172123004/ )

Reason for revert:
Reverting this change as it has resulted in much higher number of reports than
anticipated. We have enough data to investigate and can reland a modified
version if needed.

Original issue's description:
> Add check for mismatching item and document sequence numbers.
> 
> When a PageState update is received from the renderer process, it must
> be for the current session history entry. This means that the sequence
> numbers associated with the FrameNavigationEntry should match the ones
> coming from the renderer process.
> This CL is adding explicit check for this and a DumpWithoutCrashing to
> help diagnose what cases can cause a mismatch.
> 
> BUG=628677
> 
> Committed: https://crrev.com/e3e35c2d36325c10840b60d2a7cb2a7fe1c6cd14
> Cr-Commit-Position: refs/heads/master@{#407316}

TBR=creis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=628677
==========

to

==========
Revert of Add check for mismatching item and document sequence numbers.
(patchset #2 id:20001 of https://codereview.chromium.org/2172123004/ )

Reason for revert:
Reverting this change as it has resulted in much higher number of reports than
anticipated. We have enough data to investigate and can reland a modified
version if needed.

Original issue's description:
> Add check for mismatching item and document sequence numbers.
>
> When a PageState update is received from the renderer process, it must
> be for the current session history entry. This means that the sequence
> numbers associated with the FrameNavigationEntry should match the ones
> coming from the renderer process.
> This CL is adding explicit check for this and a DumpWithoutCrashing to
> help diagnose what cases can cause a mismatch.
>
> BUG=628677
>
> Committed: https://crrev.com/e3e35c2d36325c10840b60d2a7cb2a7fe1c6cd14
> Cr-Commit-Position: refs/heads/master@{#407316}

TBR=creis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=628677

Committed: https://crrev.com/10a855e46c9e920bcddd65b79f5047e35f1107ae
Cr-Commit-Position: refs/heads/master@{#407893}
==========

[commit-bot: I haz the power, 2016-07-26 20:10:28]

Patchset 1 (id:??) landed as
https://crrev.com/10a855e46c9e920bcddd65b79f5047e35f1107ae
Cr-Commit-Position: refs/heads/master@{#407893}