Move ManifestHandlers to extensions/

Move ManifestHandlers for:
- CSP
- Kiosk Mode
- Offline Enabled
- Requirements
- Sandboxed Page
to top-level extensions/common/manifest_handlers.
Rename all handlers to be foo_info.h/cc, if necessary.

TBR=davemoore@chromium.org (c/b/chromeos/app_mode/startup_app_launcher.cc)
TBR=finnur@chromium.org (c/b/ui/webui/extensions/extension_basic_info.cc)
BUG=159265

Review URL: https://codereview.chromium.org/83843002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237426 0039d316-1c4b-4281-b951-d872f2087c98
Add Spark in the whitelist of developer private API.

BUG=323607

Review URL: https://codereview.chromium.org/89093002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237427 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237427
Remove commented out logs in base/values.cc

I believe those were unintentionally added in patch set 6 of https://chromiumcodereview.appspot.com/14699002

NOTRY=True

Review URL: https://codereview.chromium.org/89463002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237428 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237428