Fix Network Datagrid row focus bug
Fix Network Datagrid row focus bug

This CL fixes a bug where focus styles are only applied for the
waterfall column in the Network datagrid: https://drive.google.com/file/d/1aPTdJ8CqJT2JIfuMqcF4bzcolovqN67h/view

Bug: 1110854
Change-Id: I867b5496910b729a3923227b775eb09414f24c58
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2329881
Reviewed-by: Jose Leal <49360abdd51ad00da751c3d448c2dbea47853f27@microsoft.com>
Reviewed-by: Brandon Goddard <37b103671c22e8d219b41940d66d3220ab618ae9@microsoft.com>
Commit-Queue: Jack Lynch <d6fb7cfbb8c8618e756350219cb7952a0ad656b7@microsoft.com>

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