Change ipc_perftests large-message test count to 1,000

Change ipc_perftests large-message test count to 1,000

The ipc_perftests and mojo_message_pipe_perftests results appeared
designed to be compared against each other, and the ipc_perftests
appear to be designed to take about a second each. Therefore it is
presumably a bug that the final ipc_perftests test executes only 100
times (versus 1,000 times for mojo_message_pipe_perftests) and that it
executes in ~50 ms.

This change increases the iteration count from 100 to 1,000.

Committed: https://crrev.com/903fdfd764c0a298862a47630fa5db146bc874cb
Cr-Commit-Position: refs/heads/master@{#314698}

[Hajime Morrita, 2015-02-04 22:54:24]

morrita@chromium.org changed reviewers:
+ agl@chromium.org, morrita@chromium.org

[Hajime Morrita, 2015-02-04 22:54:25]

LGTM but I'm not an owner. 
agl: Could you rubberstamp this?

[agl, 2015-02-04 23:08:54]

lgtm

[Hajime Morrita, 2015-02-04 23:45:54]

The CQ bit was checked by morrita@chromium.org

[commit-bot: I haz the power, 2015-02-04 23:46:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/903513002/1

[commit-bot: I haz the power, 2015-02-05 00:58:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-05 00:59:29]

Patchset 1 (id:??) landed as
https://crrev.com/903fdfd764c0a298862a47630fa5db146bc874cb
Cr-Commit-Position: refs/heads/master@{#314698}