Browser should not crash when a page showing a quota infobar is closed/reloaded

BUG=92620
TEST=no crash

Review URL: http://codereview.chromium.org/7640020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96751 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chrome_quota_permission_context.cc

@@ -48,10 +48,7 @@ class RequestQuotaInfoBarDelegate : public ConfirmInfoBarDelegate {
         callback_(callback) {}
 
  private:
-  virtual ~RequestQuotaInfoBarDelegate() {
-    // Make sure we've dispatched the callback.
-    DCHECK(!callback_.get());
-  }
+  virtual ~RequestQuotaInfoBarDelegate() {}
 
   virtual bool ShouldExpire(
       const content::LoadCommittedDetails& details)