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 DidGetHostQuota(QuotaStatusCode status,
                       const std::string& host,
                       StorageType type,
                       int64 quota) {
    DCHECK_EQ(host_, host);
    DCHECK_EQ(type_, type);
    quota_status_ = status;
    quota_ = quota;
    CheckCompleted();
  }

  void DidGetHostQuota(QuotaStatusCode status,
                       const std::string& host,
                       StorageType type,
                       int64 quota) {
    DCHECK_EQ(host_, host);
    DCHECK_EQ(type_, type);
    quota_status_ = status;
    quota_ = quota;
    CheckCompleted();
  }
