indendation Improvement for WC_Cart
Use of time constant
OOPS! again time constant
Better docblock ;)
New line for docblock
Converted Indentations to tabs
better at get_option() @ L91
Found and fix docblock comment
check_cart_item_validity() should have have public
@access public in docblock
Reverted access public

Thanks! @tamarazuk
Merge pull request #6258 from shivapoudel/patch-2

Some changes in WC_Cart