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[about-omnibox] Performance refactoring of omnibox.js: split refresh method, extract inlined dom elements, and improved html output clearing.

1. Split `refresh` into `refreshAllResults` and `refreshNewResult` for performance reasons as explained in the comments (tldr, refreshing entire output is unnecessary when we only need to add to the output).
2. Extract variables for inlined expressions to retrieve document elements.
3. Use `Element.removeChild` instead of `Element.innerHTML = ` to clear output

Change-Id: Ia7085d97537c5f445c950ecb50f35e5880b6124a
Reviewed-on: https://chromium-review.googlesource.com/1246295
Commit-Queue: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594820}