Do not give blanket permission to the Sandboxed FileSystem directory and verify resolved paths

- Avoid giving unconditional blanket permission to the entire sandbox FileSystem data directory
- Perform the sanity check that the resolved path from the database is under the expected directory

BUG=162114
TEST=manual

Review URL: https://codereview.chromium.org/11308194

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170159 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed