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When activating Chrome app from another app, often times we are reactivating
the same browser window. In this case, we don't need to update prefs with
a new profile and window position. Avoiding prefs update is good because it
triggers JSON file writing to disk (after a 10 seconds delay).

BUG=482027

Review URL: https://codereview.chromium.org/1105423003

Cr-Commit-Position: refs/heads/master@{#327418}