Make it possible to build without enable_supervised_users.

chrome/browser/themes/theme_service.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/themes/theme_service.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 401 matching lines @@
 }
 
 bool ThemeService::ShouldInitWithSystemTheme() const {
   return false;
 }
 
 SkColor ThemeService::GetDefaultColor(int id, bool incognito) const {
   // For backward compat with older themes, some newer colors are generated from
   // older ones if they are missing.
   const int kNtpText = ThemeProperties::COLOR_NTP_TEXT;
-  const int kLabelBackground =
-      ThemeProperties::COLOR_SUPERVISED_USER_LABEL_BACKGROUND;
   switch (id) {
     case ThemeProperties::COLOR_TOOLBAR_BUTTON_ICON:
       return color_utils::HSLShift(
           gfx::kChromeIconGrey,
           GetTint(ThemeProperties::TINT_BUTTONS, incognito));
     case ThemeProperties::COLOR_TOOLBAR_BUTTON_ICON_INACTIVE:
       // The active color is overridden in GtkUi.
       return SkColorSetA(
           GetColor(ThemeProperties::COLOR_TOOLBAR_BUTTON_ICON, incognito),
           0x33);
@@ skipping 54 matching lines @@
     case ThemeProperties::COLOR_TAB_THROBBER_WAITING: {
       SkColor base_color =
           ui::GetAuraColor(id == ThemeProperties::COLOR_TAB_THROBBER_SPINNING
                                ? ui::NativeTheme::kColorId_ThrobberSpinningColor
                                : ui::NativeTheme::kColorId_ThrobberWaitingColor,
                            nullptr);
       color_utils::HSL hsl = GetTint(ThemeProperties::TINT_BUTTONS, incognito);
       return color_utils::HSLShift(base_color, hsl);
     }
 #if BUILDFLAG(ENABLE_SUPERVISED_USERS)
-    case ThemeProperties::COLOR_SUPERVISED_USER_LABEL:
+    case ThemeProperties::COLOR_SUPERVISED_USER_LABEL: {
+      constexpr int kLabelBackground =
+          ThemeProperties::COLOR_SUPERVISED_USER_LABEL_BACKGROUND;
       return color_utils::GetReadableColor(
           SK_ColorWHITE, GetColor(kLabelBackground, incognito));
+    }
     case ThemeProperties::COLOR_SUPERVISED_USER_LABEL_BACKGROUND:
       return color_utils::BlendTowardOppositeLuma(
           GetColor(ThemeProperties::COLOR_FRAME, incognito), 0x80);
     case ThemeProperties::COLOR_SUPERVISED_USER_LABEL_BORDER:
       return color_utils::AlphaBlend(GetColor(kLabelBackground, incognito),
                                      SK_ColorBLACK, 230);
 #endif
   }
 
   // Always fall back to the non-incognito color when there's a custom theme
@@ skipping 412 matching lines @@
 
 #if BUILDFLAG(ENABLE_SUPERVISED_USERS)
 bool ThemeService::IsSupervisedUser() const {
   return profile_->IsSupervised();
 }
 
 void ThemeService::SetSupervisedUserTheme() {
   SetCustomDefaultTheme(new SupervisedUserTheme);
 }
 #endif