Adding the VerifyModule function (and helpers) to safe browsing.

Recommitting: https://codereview.chromium.org/406043003/
(originally reverted because the buildbots weren't pointed 
to verifier_test_dll.dll by unit_tests.isolate)

=========================================================
Adding the VerifyModule function (and helpers) to safe browsing.

This function allows us to compare a module in memory with 
its original on disk, and identify any differences (after 
accounting for relocations).  The state of the module 
(MODULE_UNKNOWN, MODULE_UNMODIFIED or MODULE_MODIFIED) is 
returned along with a list of the possibly modified exported 
functions of the module.


BUG=401854
TBR= noelutz@google.com, robertshield@chromium.org, csharp@chromium.org, asvitkine@chromium.org, grt@chromium.org
NOTRY=True

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=288417

[krstnmnlsn, 2014-08-08 19:25:17]

The CQ bit was checked by krstnmnlsn@chromium.org

[commit-bot: I haz the power, 2014-08-08 19:27:29]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/krstnmnlsn@chromium.org/451893003/20001

[commit-bot: I haz the power, 2014-08-08 19:27:30]

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

[commit-bot: I haz the power, 2014-08-08 19:27:31]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[csharp, 2014-08-08 19:29:59]

lgtm

[csharp, 2014-08-08 19:30:04]

The CQ bit was checked by csharp@chromium.org

[commit-bot: I haz the power, 2014-08-08 19:31:48]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/krstnmnlsn@chromium.org/451893003/20001

[csharp, 2014-08-08 19:33:19]

The CQ bit was unchecked by csharp@chromium.org

[csharp, 2014-08-08 19:34:15]

On 2014/08/08 19:33:19, csharp wrote:
> The CQ bit was unchecked by mailto:csharp@chromium.org

Setting NOTRY=true since this change previous landed via the CQ, so it shouldn't
hit any issues there.

[csharp, 2014-08-08 19:34:18]

The CQ bit was checked by csharp@chromium.org

[commit-bot: I haz the power, 2014-08-08 19:35:38]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/krstnmnlsn@chromium.org/451893003/20001

[commit-bot: I haz the power, 2014-08-08 19:38:29]

Change committed as 288417