Retrieve per host storage usage from QuotaManager.

R=kinuko@chromium.org
BUG=none
TEST=QuotaManagerTest.GetUsage

Review URL: http://codereview.chromium.org/8079004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@103921 0039d316-1c4b-4281-b951-d872f2087c98
  void GetUsageAndQuotaForEviction() {
    quota_status_ = kQuotaStatusUnknown;
    usage_ = -1;
    unlimited_usage_ = -1;
    quota_ = -1;
    available_space_ = -1;
    quota_manager_->GetUsageAndQuotaForEviction(
        callback_factory_.NewCallback(
            &QuotaManagerTest::DidGetUsageAndQuotaForEviction));
  }

  void GetUsageAndQuotaForEviction() {
    quota_status_ = kQuotaStatusUnknown;
    usage_ = -1;
    unlimited_usage_ = -1;
    quota_ = -1;
    available_space_ = -1;
    quota_manager_->GetUsageAndQuotaForEviction(
        callback_factory_.NewCallback(
            &QuotaManagerTest::DidGetUsageAndQuotaForEviction));
  }
