Fix component build error in GN build.

Fix component build error in GN build.

The shared memory support functions weren't getting exported properly, and the right targets didn't depend on it. This is the last component build failure in the GN build as of now.

R=dpranke@chromium.org

Committed: https://crrev.com/390e5e853807f684a2250be30039c32dca96d02a
Cr-Commit-Position: refs/heads/master@{#294608}

[brettw, 2014-09-11 19:48:18]

brettw@chromium.org changed reviewers:
+ dpranke@chromioum.org

[Dirk Pranke, 2014-09-11 20:18:06]

dpranke@chromium.org changed reviewers:
+ dpranke@chromium.org

[Dirk Pranke, 2014-09-11 20:18:07]

lgtm

[Jason Robbins -- corp, 2014-09-11 20:24:23]

jrobbins@google.com changed reviewers:
- dpranke@chromioum.org

[brettw, 2014-09-11 21:03:54]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2014-09-11 21:31:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/549043005/1

[commit-bot: I haz the power, 2014-09-11 22:33:12]

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

[commit-bot: I haz the power, 2014-09-11 22:33:13]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[brettw, 2014-09-12 17:19:00]

Committed patchset #1 (id:1) to pending queue manually as 75275fd.

[commit-bot: I haz the power, 2014-09-12 17:22:35]

Patchset 1 (id:??) landed as
https://crrev.com/390e5e853807f684a2250be30039c32dca96d02a
Cr-Commit-Position: refs/heads/master@{#294608}