[wasm] Refactor handling of data segments in WasmModuleBuilder.

[wasm] Refactor handling of data segments in WasmModuleBuilder.

R=bradnelson@chromium.org,aseemgarg@chromium.org,mstarzinger@chromium.org
BUG=

Committed: https://crrev.com/ab21fec6d3e3c36f8dfb81e64380f9a771b380e1
Cr-Commit-Position: refs/heads/master@{#39887}

[titzer, 2016-09-29 13:52:41]

The CQ bit was checked by titzer@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-29 13:52:51]

Dry run: 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, 2016-09-29 14:30:41]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-29 14:30:42]

Dry run: This issue passed the CQ dry run.

[bradn, 2016-09-29 18:10:59]

bradnelson@google.com changed reviewers:
+ bradnelson@google.com

[bradn, 2016-09-29 18:10:59]

The CQ bit was checked by bradnelson@google.com

[bradn, 2016-09-29 18:11:00]

lgtm

[commit-bot: I haz the power, 2016-09-29 18:11:10]

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, 2016-09-29 18:13:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-29 18:13:50]

Description was changed from

==========
[wasm] Refactor handling of data segments in WasmModuleBuilder.

R=bradnelson@chromium.org,aseemgarg@chromium.org,mstarzinger@chromium.org
BUG=
==========

to

==========
[wasm] Refactor handling of data segments in WasmModuleBuilder.

R=bradnelson@chromium.org,aseemgarg@chromium.org,mstarzinger@chromium.org
BUG=

Committed: https://crrev.com/ab21fec6d3e3c36f8dfb81e64380f9a771b380e1
Cr-Commit-Position: refs/heads/master@{#39887}
==========

[commit-bot: I haz the power, 2016-09-29 18:13:51]

Patchset 1 (id:??) landed as
https://crrev.com/ab21fec6d3e3c36f8dfb81e64380f9a771b380e1
Cr-Commit-Position: refs/heads/master@{#39887}