Revert of [ios] ARCMigrate ios/chrome/browser/tabs/tab.mm to ARC.

Revert of [ios] ARCMigrate ios/chrome/browser/tabs/tab.mm to ARC. (patchset #3 id:40001 of https://codereview.chromium.org/2846233002/ )

Reason for revert:
causes failure of ios_chrome_ui_egtests on ipad air 2 ios 10.

Ref: https://build.chromium.org/p/chromium.fyi/builders/EarlGreyiOS/builds/27116

Original issue's description:
> [ios] ARCMigrate ios/chrome/browser/tabs/tab.mm to ARC.
> 
> Semi-automatic conversion of ios/chrome/browser/tabs/tab.mm
> to ARC (Automatic Reference Counting).
> 
> Manual changes:
> -   audit raw Objective-C pointers and mark them as __weak if
>     needed (were all correctly annotated with weak comments);
> -   convert base::scoped_nsobject<> & base::WeakNSObject<> to
>     annotations for the compiler (e.g. __weak);
> -   remove setter/getter for properties that can be synthesized;
> -   remove [[... retain] autorelease] as the CRWWebController
>     has been converted to ARC already and thus the object will
>     be autorelease and the hack is no longer required.
> 
> BUG=None
> 
> Review-Url: https://codereview.chromium.org/2846233002
> Cr-Commit-Position: refs/heads/master@{#468660}
> Committed: https://chromium.googlesource.com/chromium/src/+/376186504c93feac078435f1620005d15609974f

TBR=stkhapugin@chromium.org,rohitrao@chromium.org,sdefresne@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Review-Url: https://codereview.chromium.org/2859663002
Cr-Commit-Position: refs/heads/master@{#468777}
Committed: https://chromium.googlesource.com/chromium/src/+/d8fea1f6efe2eb10d4b1f1c41a5cf62fa2dfc5d6

[michaeldo, 2017-05-02 21:22:49]

The CQ bit was checked by michaeldo@chromium.org

[michaeldo, 2017-05-02 21:22:50]

Created Revert of [ios] ARCMigrate ios/chrome/browser/tabs/tab.mm to ARC.

[commit-bot: I haz the power, 2017-05-02 21:23:29]

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, 2017-05-02 21:25:11]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493760169516890, "parent_rev":
"fa5e572013e1c46993b8e79da9e55b58a0f2c86e", "commit_rev":
"d8fea1f6efe2eb10d4b1f1c41a5cf62fa2dfc5d6"}

[commit-bot: I haz the power, 2017-05-02 21:25:22]

Description was changed from

==========
Revert of [ios] ARCMigrate ios/chrome/browser/tabs/tab.mm to ARC. (patchset #3
id:40001 of https://codereview.chromium.org/2846233002/ )

Reason for revert:
causes failure of ios_chrome_ui_egtests on ipad air 2 ios 10.

Ref: https://build.chromium.org/p/chromium.fyi/builders/EarlGreyiOS/builds/27116

Original issue's description:
> [ios] ARCMigrate ios/chrome/browser/tabs/tab.mm to ARC.
> 
> Semi-automatic conversion of ios/chrome/browser/tabs/tab.mm
> to ARC (Automatic Reference Counting).
> 
> Manual changes:
> -   audit raw Objective-C pointers and mark them as __weak if
>     needed (were all correctly annotated with weak comments);
> -   convert base::scoped_nsobject<> & base::WeakNSObject<> to
>     annotations for the compiler (e.g. __weak);
> -   remove setter/getter for properties that can be synthesized;
> -   remove [[... retain] autorelease] as the CRWWebController
>     has been converted to ARC already and thus the object will
>     be autorelease and the hack is no longer required.
> 
> BUG=None
> 
> Review-Url: https://codereview.chromium.org/2846233002
> Cr-Commit-Position: refs/heads/master@{#468660}
> Committed:
https://chromium.googlesource.com/chromium/src/+/376186504c93feac078435f16200...

TBR=stkhapugin@chromium.org,rohitrao@chromium.org,sdefresne@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None
==========

to

==========
Revert of [ios] ARCMigrate ios/chrome/browser/tabs/tab.mm to ARC. (patchset #3
id:40001 of https://codereview.chromium.org/2846233002/ )

Reason for revert:
causes failure of ios_chrome_ui_egtests on ipad air 2 ios 10.

Ref: https://build.chromium.org/p/chromium.fyi/builders/EarlGreyiOS/builds/27116

Original issue's description:
> [ios] ARCMigrate ios/chrome/browser/tabs/tab.mm to ARC.
> 
> Semi-automatic conversion of ios/chrome/browser/tabs/tab.mm
> to ARC (Automatic Reference Counting).
> 
> Manual changes:
> -   audit raw Objective-C pointers and mark them as __weak if
>     needed (were all correctly annotated with weak comments);
> -   convert base::scoped_nsobject<> & base::WeakNSObject<> to
>     annotations for the compiler (e.g. __weak);
> -   remove setter/getter for properties that can be synthesized;
> -   remove [[... retain] autorelease] as the CRWWebController
>     has been converted to ARC already and thus the object will
>     be autorelease and the hack is no longer required.
> 
> BUG=None
> 
> Review-Url: https://codereview.chromium.org/2846233002
> Cr-Commit-Position: refs/heads/master@{#468660}
> Committed:
https://chromium.googlesource.com/chromium/src/+/376186504c93feac078435f16200...

TBR=stkhapugin@chromium.org,rohitrao@chromium.org,sdefresne@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Review-Url: https://codereview.chromium.org/2859663002
Cr-Commit-Position: refs/heads/master@{#468777}
Committed:
https://chromium.googlesource.com/chromium/src/+/d8fea1f6efe2eb10d4b1f1c41a5c...
==========

[commit-bot: I haz the power, 2017-05-02 21:25:23]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/d8fea1f6efe2eb10d4b1f1c41a5c...