base: Remove non-caching discardable memory implementation.

base: Remove non-caching discardable memory implementation.

This removes the "malloc" implementation of discardable memory.
This implementation exists for test and debugging purproses but
we currently don't have any tests that depend on it so it can be
removed to reduce code size.

This implementation can still be very useful to manually track
down bugs and performance issues in discardable memory clients
but can be maintained separately to reduce code size.

BUG=422953
TBR=danakj@chromium.org

Committed: https://crrev.com/e5f918c09ca74cc64f92ad5fd81f071687165248
Cr-Commit-Position: refs/heads/master@{#299374}

[reveman, 2014-10-13 16:53:15]

reveman@chromium.org changed reviewers:
+ avi@chromium.org, danakj@chromium.org

[Avi (use Gerrit), 2014-10-13 17:09:12]

lgtm

[reveman, 2014-10-13 20:38:00]

The CQ bit was checked by reveman@chromium.org

[commit-bot: I haz the power, 2014-10-13 20:39:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/651913003/150001

[commit-bot: I haz the power, 2014-10-13 22:00:27]

Committed patchset #2 (id:150001)

[commit-bot: I haz the power, 2014-10-13 22:01:08]

Patchset 2 (id:??) landed as
https://crrev.com/e5f918c09ca74cc64f92ad5fd81f071687165248
Cr-Commit-Position: refs/heads/master@{#299374}