cc: Use visible_rect_for_tile_priority_ where approriate

|visible_rect_for_tile_priority_| was added for Android WebView to
replace content_visible_rect(). The latter may not always be valid for
in Android WebView for tile prioritization or activation considerations.

This partially reverts https://codereview.chromium.org/517893002

BUG=418834

Review URL: https://codereview.chromium.org/616543004

Cr-Commit-Position: refs/heads/master@{#297659}
7 files changed