[Android] Fix and re-enable heap_profiler unittests.

[Android] Fix and re-enable heap_profiler unittests.

This fixes the breakage on the 64-bit build that caused the
revert in crrev.com/386073002.
This also re-enables tests originally introduced by crrev.com/351183003.
TBRing since the original CL was aready LGTM and the fix on top is trivial.

BUG=382489
NOTRY=true
TBR=navabi@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=283109

[Primiano Tucci (use gerrit), 2014-07-14 20:50:58]

The CQ bit was checked by primiano@chromium.org

[commit-bot: I haz the power, 2014-07-14 20:53:12]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/primiano@chromium.org/395543003/1

[navabi1, 2014-07-15 00:12:56]

lgtm

[Primiano Tucci (use gerrit), 2014-07-15 00:16:07]

The CQ bit was unchecked by primiano@chromium.org

[Primiano Tucci (use gerrit), 2014-07-15 00:16:24]

The CQ bit was checked by primiano@chromium.org

[Primiano Tucci (use gerrit), 2014-07-15 00:17:37]

On 2014/07/15 00:16:07, Primiano Tucci wrote:
> The CQ bit was unchecked by mailto:primiano@chromium.org

Adding NOTRY as all the bots are happy and win_ is being the party-waster as
usual (and this cl doesn't affect win at all).

[commit-bot: I haz the power, 2014-07-15 00:19:22]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/primiano@chromium.org/395543003/1

[commit-bot: I haz the power, 2014-07-15 00:39:12]

Change committed as 283109