removing useless code. [rails#4988 state:resolved]

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>

activerecord/lib/active_record/connection_adapters/sqlite_adapter.rb

@@ -151,7 +151,7 @@ def quoted_date(value) #:nodoc:
       # DATABASE STATEMENTS ======================================
 
       def execute(sql, name = nil) #:nodoc:
-        catch_schema_changes { log(sql, name) { @connection.execute(sql) } }
+        log(sql, name) { @connection.execute(sql) }
       end
 
       def update_sql(sql, name = nil) #:nodoc:
@@ -176,15 +176,15 @@ def select_rows(sql, name = nil)
       end
 
       def begin_db_transaction #:nodoc:
-        catch_schema_changes { @connection.transaction }
+        @connection.transaction
       end
 
       def commit_db_transaction #:nodoc:
-        catch_schema_changes { @connection.commit }
+        @connection.commit
       end
 
       def rollback_db_transaction #:nodoc:
-        catch_schema_changes { @connection.rollback }
+        @connection.rollback
       end
 
       # SCHEMA STATEMENTS ========================================
@@ -391,17 +391,6 @@ def copy_table_contents(from, to, columns, rename = {}) #:nodoc:
           end
         end
 
-        def catch_schema_changes
-          return yield
-        rescue ActiveRecord::StatementInvalid => exception
-          if exception.message =~ /database schema has changed/
-            reconnect!
-            retry
-          else
-            raise
-          end
-        end
-
         def sqlite_version
           @sqlite_version ||= SQLiteAdapter::Version.new(select_value('select sqlite_version(*)'))
         end