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This CL is a pure refactor of app list search result icon sizes which were
previously constants scattered about the codebase. This CL puts the icon
size as a static function in SearchResult so that there is only one place
the size needs to be changed.

BUG=391348

Review URL: https://codereview.chromium.org/458983004

Cr-Commit-Position: refs/heads/master@{#289517}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289517 0039d316-1c4b-4281-b951-d872f2087c98