Use correct creation context during Iterable.forEach iteration

Use correct creation context during Iterable.forEach iteration

Use |thisValue| instead of |scriptState->context()->Global()|, since this
is simpler and since Global() actually returns a WindowProxy object that
may change and become incorrect to use as creation context depending on
what the callback function does.

BUG=605910
Review URL: https://codereview.chromium.org/1918763002

Cr-Commit-Position: refs/heads/master@{#389785}
(cherry picked from commit 0cd7a9f853e3cb7c035b4ab9e07a503552267f9d)

Committed: https://chromium.googlesource.com/chromium/src/+/cfb182b8d5cdc104ba1e9c09125c918b00e850bb

[Jens Widell, 2016-05-09 06:50:38]

Description was changed from

==========
Use correct creation context during Iterable.forEach iteration

Use |thisValue| instead of |scriptState->context()->Global()|, since this
is simpler and since Global() actually returns a WindowProxy object that
may change and become incorrect to use as creation context depending on
what the callback function does.

BUG=605910

Review URL: https://codereview.chromium.org/1918763002

Cr-Commit-Position: refs/heads/master@{#389785}
(cherry picked from commit 0cd7a9f853e3cb7c035b4ab9e07a503552267f9d)
==========

to

==========
Use correct creation context during Iterable.forEach iteration

Use |thisValue| instead of |scriptState->context()->Global()|, since this
is simpler and since Global() actually returns a WindowProxy object that
may change and become incorrect to use as creation context depending on
what the callback function does.

BUG=605910

Review URL: https://codereview.chromium.org/1918763002

Cr-Commit-Position: refs/heads/master@{#389785}
(cherry picked from commit 0cd7a9f853e3cb7c035b4ab9e07a503552267f9d)

Committed:
https://chromium.googlesource.com/chromium/src/+/cfb182b8d5cdc104ba1e9c09125c...
==========

[Jens Widell, 2016-05-09 06:50:39]

Committed patchset #1 (id:1) manually as
cfb182b8d5cdc104ba1e9c09125c918b00e850bb (tree was closed).