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The changes make it possible to focus individual downloads by using UP/DOWN on the keyboard (like other tables and lists). It is possible to move between the links in a specific download using LEFT/RIGHT and TAB. Focus changes with TAB are achieved by relying on the focusing of elements rather than capturing the keys. This allows screen readers to focus elements without weird behavior.

Changes in FocusRow to support TAB navigation will also affect the history page. This change will keep both pages consistent.

BUG=427670,452870

Review URL: https://codereview.chromium.org/807593005

Cr-Commit-Position: refs/heads/master@{#314416}