Do not open a new connection if one has already been opened.

TEST=none
BUG=none


Review URL: http://codereview.chromium.org/405005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@32201 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/app/sql/connection.cc b/app/sql/connection.cc
index dd3756e..8f74e6e 100644
--- a/app/sql/connection.cc
+++ b/app/sql/connection.cc
@@ -264,6 +264,11 @@
 }
 
 bool Connection::OpenInternal(const std::string& file_name) {
+  if (db_) {
+    NOTREACHED() << "sql::Connection is already open.";
+    return false;
+  }
+
   int err = sqlite3_open(file_name.c_str(), &db_);
   if (err != SQLITE_OK) {
     OnSqliteError(err, NULL);