Make cr.ui.FocusRow inherit from HTMLElement
Make cr.ui.FocusRow inherit from HTMLElement

There's nothing different about the IDL of HTMLDivElement vs HTMLElement
except for the obsolete [align] attribute.[1]

BUG=425626
R=hcarmona@chromium.org

[1] third_party/WebKit/Source/core/html/HTMLDivElement.idl

NOTRY=true

Review URL: https://codereview.chromium.org/1283873003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#342769}

ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,CapOM/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend,ltilve/ChromiumGStreamerBackend