Purge UnspecifiedBoolType from Blink.

Purge UnspecifiedBoolType from Blink.

The modern pattern is "explicit operator bool". std::unique_ptr and WTF::RefPtr
already do this, so this just pushes out to the remaining uses, except for one
in WTF::String, which exists to conflict with operator NSString* on Mac and
prevent boolean conversion via that (implicitly).

Committed: https://crrev.com/f47b411ebf78e4215a7313a5d8535377753446ac
Cr-Commit-Position: refs/heads/master@{#405013}

[jbroman, 2016-07-12 20:11:18]

jbroman@chromium.org changed reviewers:
+ haraken@chromium.org

[jbroman, 2016-07-12 20:11:18]

Not important, but pushing this cleanup through. Should have no performance
impact (though bug 605080 happened with RefPtr, it seems unlikely to happen
again).

[haraken, 2016-07-13 00:05:41]

LGTM

[jbroman, 2016-07-13 00:59:14]

The CQ bit was checked by jbroman@chromium.org

[commit-bot: I haz the power, 2016-07-13 01:04:53]

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, 2016-07-13 04:20:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-13 04:23:43]

Description was changed from

==========
Purge UnspecifiedBoolType from Blink.

The modern pattern is "explicit operator bool". std::unique_ptr and WTF::RefPtr
already do this, so this just pushes out to the remaining uses, except for one
in WTF::String, which exists to conflict with operator NSString* on Mac and
prevent boolean conversion via that (implicitly).
==========

to

==========
Purge UnspecifiedBoolType from Blink.

The modern pattern is "explicit operator bool". std::unique_ptr and WTF::RefPtr
already do this, so this just pushes out to the remaining uses, except for one
in WTF::String, which exists to conflict with operator NSString* on Mac and
prevent boolean conversion via that (implicitly).

Committed: https://crrev.com/f47b411ebf78e4215a7313a5d8535377753446ac
Cr-Commit-Position: refs/heads/master@{#405013}
==========

[commit-bot: I haz the power, 2016-07-13 04:23:45]

Patchset 1 (id:??) landed as
https://crrev.com/f47b411ebf78e4215a7313a5d8535377753446ac
Cr-Commit-Position: refs/heads/master@{#405013}