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This CL removes the system theme check for web apps in ShouldUseTheme().
This logic now lives in BrowserFrame::GetThemeProvider() as of:
https://chromium-review.googlesource.com/c/chromium/src/+/2239912

Bug: 1087693
Change-Id: Icd006bccab2fe08112990f8c856ecf4c75fef0c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309993
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791041}