Change setIsLink to conform with other nonproperty setters.

In ComputedStyle, there are a few fields that are not CSS properties.
They are mostly boolean fields, with getters and setters. The setters
take no arguments and simply sets the boolean field to true. One
exception is the isLink field, whose setter takes an argument and assigns
the field to the argument (like a normal setter). However, we only use
the setter as 'setIsLink(true)'. This patch changes the setIsLink setter
to conform to the other nonproperty setters.

This is prework for generating nonproperty fields in ComputedStyle. This
patch allows us to generate the setter for isLink like the other
nonproperty fields.

BUG=628043

Review-Url: https://codereview.chromium.org/2665603002
Cr-Commit-Position: refs/heads/master@{#447173}
2 files changed