Revert of WTF: Simplify RefPtr::operator bool.

Revert of WTF: Simplify RefPtr::operator bool. (patchset #1 id:1 of https://codereview.chromium.org/2072703002/ )

Reason for revert:
Broke x64 build, see original patch for details.

Original issue's description:
> WTF: Simplify RefPtr::operator bool.
>
> The problematic case in String::find on ARM should now be gone, and so this
> should be both simpler and equally fast.
>
> BUG=607208
>
> Committed: https://crrev.com/2b6875bfd954d336432702512d1ffe4c83343d2b
> Cr-Commit-Position: refs/heads/master@{#400315}

TBR=thakis@chromium.org,jbroman@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=607208
Committed: https://crrev.com/2862dfadaa7fc3b96a2f56facb00ef736fbe70d9
Cr-Commit-Position: refs/heads/master@{#400325}

[DaleCurtis, 2016-06-17 01:19:56]

The CQ bit was checked by dalecurtis@chromium.org

[DaleCurtis, 2016-06-17 01:19:56]

Created Revert of WTF: Simplify RefPtr::operator bool.

[commit-bot: I haz the power, 2016-06-17 01:20:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2071183002/1

[commit-bot: I haz the power, 2016-06-17 01:20:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-17 01:22:44]

Description was changed from

==========
Revert of WTF: Simplify RefPtr::operator bool. (patchset #1 id:1 of
https://codereview.chromium.org/2072703002/ )

Reason for revert:
Broke x64 build, see original patch for details.

Original issue's description:
> WTF: Simplify RefPtr::operator bool.
> 
> The problematic case in String::find on ARM should now be gone, and so this
> should be both simpler and equally fast.
> 
> BUG=607208
> 
> Committed: https://crrev.com/2b6875bfd954d336432702512d1ffe4c83343d2b
> Cr-Commit-Position: refs/heads/master@{#400315}

TBR=thakis@chromium.org,jbroman@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=607208
==========

to

==========
Revert of WTF: Simplify RefPtr::operator bool. (patchset #1 id:1 of
https://codereview.chromium.org/2072703002/ )

Reason for revert:
Broke x64 build, see original patch for details.

Original issue's description:
> WTF: Simplify RefPtr::operator bool.
>
> The problematic case in String::find on ARM should now be gone, and so this
> should be both simpler and equally fast.
>
> BUG=607208
>
> Committed: https://crrev.com/2b6875bfd954d336432702512d1ffe4c83343d2b
> Cr-Commit-Position: refs/heads/master@{#400315}

TBR=thakis@chromium.org,jbroman@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=607208

Committed: https://crrev.com/2862dfadaa7fc3b96a2f56facb00ef736fbe70d9
Cr-Commit-Position: refs/heads/master@{#400325}
==========

[commit-bot: I haz the power, 2016-06-17 01:22:45]

Patchset 1 (id:??) landed as
https://crrev.com/2862dfadaa7fc3b96a2f56facb00ef736fbe70d9
Cr-Commit-Position: refs/heads/master@{#400325}