Revert "Sync wallpaper based on sync themes setting"

chrome/browser/chromeos/extensions/wallpaper_private_api.h

Index: chrome/browser/chromeos/extensions/wallpaper_private_api.h
diff --git a/chrome/browser/chromeos/extensions/wallpaper_private_api.h b/chrome/browser/chromeos/extensions/wallpaper_private_api.h
index a5b1c3fae6f4a40d3ab9fc8bee40f6401d978654..4b3fb0c1b143d6974f3a1131ec037faada8e307b 100644
--- a/chrome/browser/chromeos/extensions/wallpaper_private_api.h
+++ b/chrome/browser/chromeos/extensions/wallpaper_private_api.h
@@ -27,19 +27,6 @@ class WallpaperPrivateGetStringsFunction : public SyncExtensionFunction {
   virtual bool RunSync() override;
 };
 
-// Check if sync themes setting is enabled.
-class WallpaperPrivateGetSyncSettingFunction : public SyncExtensionFunction {
- public:
-  DECLARE_EXTENSION_FUNCTION("wallpaperPrivate.getSyncSetting",
-                             WALLPAPERPRIVATE_GETSYNCSETTING)
-
- protected:
-  virtual ~WallpaperPrivateGetSyncSettingFunction() {}
-
-  // SyncExtensionFunction overrides.
-  virtual bool RunSync() override;
-};
-
 class WallpaperPrivateSetWallpaperIfExistsFunction
     : public WallpaperFunctionBase {
  public: