Revert of Inlining DeathData accessors, per earlier CR's comment

Revert of Inlining DeathData accessors, per earlier CR's comment (patchset #1 id:1 of https://codereview.chromium.org/1113463003/)

Reason for revert:
Suspecting this CL caused crashes (https://code.google.com/p/chromium/issues/detail?id=483255).

Original issue's description:
> Inlining DeathData accessors, per earlier CR's comment.
>
> BUG=456354
>
> Committed: https://crrev.com/9e0a3c19c221db002fdd5512b0d56dde675e005b
> Cr-Commit-Position: refs/heads/master@{#327350}

TBR=asvitkine@google.com,isherman@chromium.org,asvitkine@chromium.org,cpu@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=456354
Committed: https://crrev.com/f02f0cc4ee8f12e53cd57a97bd2d6ef4c3af87ff
Cr-Commit-Position: refs/heads/master@{#327798}

[vadimt, 2015-04-30 21:51:14]

Created Revert of Inlining DeathData accessors, per earlier CR's comment

[commit-bot: I haz the power, 2015-04-30 21:52:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1118753003/1

[commit-bot: I haz the power, 2015-04-30 21:54:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-30 21:55:43]

Patchset 1 (id:??) landed as
https://crrev.com/f02f0cc4ee8f12e53cd57a97bd2d6ef4c3af87ff
Cr-Commit-Position: refs/heads/master@{#327798}

[vadimt, 2015-05-06 22:12:07]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1129073002/ by vadimt@chromium.org.

The reason for reverting is: Since the crash reports started before the original
CL landed, reverting the revert..