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- Inline the function into the caller. The condition for Android and
  ChromeOS should not be in DeviceScaleEnsuresTextQuality() becuase
  we can't ensure text quality but just accept to sacrifice text
  quality for better compositing.

- Add a comment about keeping sync about the DSF threshold in
  cc/metrics/lcd_text_metrics_reporter.cc.

Bug: 642885
Change-Id: Idb58ebc21db32ded979b24c444497abff37c4a2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2155279Reviewed-by: Stefan Zager <szager@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761089}