Remove use of deprecated v8::StartupData::compressed_size.

Remove use of deprecated v8::StartupData::compressed_size.

Compressed startup data is not being used anyways, and is
being removed from V8.

Committed: https://crrev.com/78e112fa382aa11e1542f736195035e0421682ef
Cr-Commit-Position: refs/heads/master@{#305237}

[Yang, 2014-11-21 12:23:06]

yangguo@chromium.org changed reviewers:
+ jam@chromium.org

[jam, 2014-11-21 16:58:20]

lgtm

[Yang, 2014-11-21 16:59:07]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2014-11-21 16:59:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/740653004/1

[commit-bot: I haz the power, 2014-11-21 17:48:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-21 17:49:58]

Patchset 1 (id:??) landed as
https://crrev.com/78e112fa382aa11e1542f736195035e0421682ef
Cr-Commit-Position: refs/heads/master@{#305237}