Revert of Replace CONTROL_BACKGROUND and DETACHED_BOOKMARK_BAR_BACKGROUND by COLOR_NTP_BACKGROUND (patchset #8 id:140001 of https://codereview.chromium.org/2062353002/ )

Reason for revert:
caused regression: crbug.com/628970

Original issue's description:
> Replace CONTROL_BACKGROUND and DETACHED_BOOKMARK_BAR_BACKGROUND by COLOR_NTP_BACKGROUND
>
> This fixes issues where the ntp background image was
> interrupted underneath the detached bookmark bar.
>
> Also the ntp_background color is now forced to be opaque
> even if a none opaque alpha value is provided from the
> theme. This prevent issues with subpixel AA which does not
> work on none opaque background. (and to avoid falling back
> to grayscale AA)
>
> Also see crbug.com/618278
>
> BUG=618335
>
> [email protected], [email protected]
>
> Committed: https://crrev.com/bb4e97590966ba4138b759b8a6450e526a24fa27
> Cr-Commit-Position: refs/heads/master@{#405725}

[email protected],[email protected]
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=618335

Review-Url: https://codereview.chromium.org/2159833002
Cr-Commit-Position: refs/heads/master@{#406118}
diff --git a/chrome/browser/themes/theme_service.cc b/chrome/browser/themes/theme_service.cc
index 5ffd491e..3abfc22 100644
--- a/chrome/browser/themes/theme_service.cc
+++ b/chrome/browser/themes/theme_service.cc
@@ -468,6 +468,10 @@
       if (UsingDefaultTheme())
         break;
       return GetColor(ThemeProperties::COLOR_BOOKMARK_TEXT, incognito);
+    case ThemeProperties::COLOR_DETACHED_BOOKMARK_BAR_BACKGROUND:
+      if (UsingDefaultTheme())
+        break;
+      return GetColor(ThemeProperties::COLOR_TOOLBAR, incognito);
     case ThemeProperties::COLOR_DETACHED_BOOKMARK_BAR_SEPARATOR:
       if (UsingDefaultTheme())
         break;