Avoid unnecessary wtf/text/WTFString.h includes in platform/heap/

Avoid unnecessary wtf/text/WTFString.h includes in platform/heap/

Oilpan header files are included across most of Blink, so tidy up various
downstream code that implicitly assumed WTFString.h's offerings to be
in scope.

R=haraken
BUG=

Committed: https://crrev.com/b17e305bdace0162607619fe17775c1e91f7f6e7
Cr-Commit-Position: refs/heads/master@{#360525}

[sof, 2015-11-18 16:55:01]

sigbjornf@opera.com changed reviewers:
+ oilpan-reviews@chromium.org

[sof, 2015-11-18 16:55:01]

please take a look.

[haraken, 2015-11-18 23:37:31]

LGTM

[sof, 2015-11-19 04:53:40]

Description was changed from

==========
Avoid unnecessary wtf/text/WTFString.h includes in platform/heap/

Oilpan header files are included across most of Blink, so tidy up various
downstream code that implicitly assumed WTFString.h's offerings to be
in scope.

R=
BUG=
==========

to

==========
Avoid unnecessary wtf/text/WTFString.h includes in platform/heap/

Oilpan header files are included across most of Blink, so tidy up various
downstream code that implicitly assumed WTFString.h's offerings to be
in scope.

R=haraken
BUG=
==========

[sof, 2015-11-19 04:53:44]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-11-19 04:54:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1460523004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1460523004/1

[commit-bot: I haz the power, 2015-11-19 04:59:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-19 05:00:22]

Patchset 1 (id:??) landed as
https://crrev.com/b17e305bdace0162607619fe17775c1e91f7f6e7
Cr-Commit-Position: refs/heads/master@{#360525}