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This also fixes the keyboard navigation for network summary items.

BUG=609156
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation
For trivial comment changes to extensions/common/api
TBR=rdevlin.cronin@chromium.org,

Review-Url: https://codereview.chromium.org/2303093003
Cr-Commit-Position: refs/heads/master@{#419088}