Return a color for inactive incognito windows in high contrast.

Bug: none
Change-Id: Ib5d1fbac1ccc7aec39cbaad56edc36c7f9fcea11
Reviewed-on: https://chromium-review.googlesource.com/1147091Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577560}

chrome/browser/themes/increased_contrast_theme_supplier.cc

@@ -22,11 +22,10 @@ bool IncreasedContrastThemeSupplier::GetColor(int id, SkColor* color) const {
       *color = SK_ColorWHITE;
       return true;
     case ThemeProperties::COLOR_FRAME_INACTIVE:
+    case ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE:
       *color = SK_ColorGRAY;
       return true;
     case ThemeProperties::COLOR_FRAME:
-      *color = SK_ColorDKGRAY;
-      return true;
     case ThemeProperties::COLOR_FRAME_INCOGNITO:
       *color = SK_ColorDKGRAY;
       return true;