FileSystem: Make SandboxDirectoryDatabase::DestroyDatabase non-static for cleanup

FileSystem: Make SandboxDirectoryDatabase::DestroyDatabase non-static for cleanup

There is no behavioral change (just a refactoring).

BUG=326429
TEST=content_unittests --gtest_filter=ObfuscatedFileUtilTest.*

Committed: https://crrev.com/da4e65e1650cc8c99af2862209f36eb88581fd7d
Cr-Commit-Position: refs/heads/master@{#296682}

[nhiroki, 2014-09-25 07:53:50]

nhiroki@chromium.org changed reviewers:
+ tzik@chromium.org

[nhiroki, 2014-09-25 07:57:21]

Hi, can you review this?

I'd like to clean up around SandboxDirectoryDatabase and ObfuscatedFileUtil
before the CL (https://codereview.chromium.org/579083004/).

Thanks!

[nhiroki, 2014-09-25 08:09:10]

As per offline chat with tzik@, I realized that we shouldn't use
ScopedPtrHashMap here since the hash map is unordered but we need such a
behavior to make prefix-match for keys in the CL
(https://codereview.chromium.org/579083004/). I'll remake this CL and send a
review request again.

[nhiroki, 2014-09-25 08:18:55]

Remade. Can you take another look? Thanks!

[tzik, 2014-09-25 08:25:28]

lgtm

[nhiroki, 2014-09-25 08:47:58]

The CQ bit was checked by nhiroki@chromium.org

[commit-bot: I haz the power, 2014-09-25 08:48:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/602043002/20001

[commit-bot: I haz the power, 2014-09-25 09:13:51]

Committed patchset #2 (id:20001) as c2bca9cc10851e14a61b824b31b14192ca60a56a

[commit-bot: I haz the power, 2014-09-25 09:14:33]

Patchset 2 (id:??) landed as
https://crrev.com/da4e65e1650cc8c99af2862209f36eb88581fd7d
Cr-Commit-Position: refs/heads/master@{#296682}