[reland] Remove SandboxBPF's dependency on CompatibilityPolicy

[reland] Remove SandboxBPF's dependency on CompatibilityPolicy

SandboxBPF users are now required to always provide a SandboxBPFPolicy
instead of a SyscallEvaluator. CompatibilityPolicy can't be removed
just yet though because it's still used by the deprecated BPF_TEST
macros.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271814

[mdempsky, 2014-05-20 15:49:06]

Patch set 1 is the originally committed patch, patch set 2 is the fixed one.  I
tried testing via MSan, but it's broken on Ubuntu 14.04 (crbug.com/375309), and
there doesn't seem to be an MSan trybot available. :(

[mdempsky, 2014-05-20 15:57:57]

On 2014/05/20 15:49:06, mdempsky wrote:
> Patch set 1 is the originally committed patch, patch set 2 is the fixed one. 
I
> tried testing via MSan, but it's broken on Ubuntu 14.04 (crbug.com/375309),
and
> there doesn't seem to be an MSan trybot available. :(

Found a workaround to use MSan on Ubuntu 14.04 (see bug), and I've verified this
revised CL is MSan clean.

(Well, the Credentials.* tests are failing on my local machine, but I'm pretty
sure that's because I'm using use_instrumented_libraries=0, and those tests
depend on libcap; even without my CL, they fail locally.)

[jln (very slow on Chromium), 2014-05-20 18:50:17]

lgtm

[mdempsky, 2014-05-20 18:50:40]

The CQ bit was checked by mdempsky@chromium.org

[commit-bot: I haz the power, 2014-05-20 18:52:21]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mdempsky@chromium.org/286903005/20001

[commit-bot: I haz the power, 2014-05-21 02:17:21]

Change committed as 271814