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This CL consolidates the SearchResultListView creation in ContentsView
into a single flow used by the classic and experimental app list. They
now both use SearchResultPageView with a SearchResultListView inside.

This change is being made to facilitate further refactoring.

BUG=455059

Review URL: https://codereview.chromium.org/896633005

Cr-Commit-Position: refs/heads/master@{#314984}