Revert of Making answer card to behave like other results.

ui/views/controls/webview/web_contents_set_background_color.h

Index: ui/views/controls/webview/web_contents_set_background_color.h
diff --git a/ui/views/controls/webview/web_contents_set_background_color.h b/ui/views/controls/webview/web_contents_set_background_color.h
deleted file mode 100644
index e10a3a3bf0669870433d28e466f2910345f51a46..0000000000000000000000000000000000000000
--- a/ui/views/controls/webview/web_contents_set_background_color.h
+++ /dev/null
@@ -1,46 +0,0 @@
-// Copyright 2016 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.
-
-#ifndef UI_VIEWS_CONTROLS_WEBVIEW_WEB_CONTENTS_SET_BACKGROUND_COLOR_H_
-#define UI_VIEWS_CONTROLS_WEBVIEW_WEB_CONTENTS_SET_BACKGROUND_COLOR_H_
-
-#include "content/public/browser/web_contents_observer.h"
-#include "content/public/browser/web_contents_user_data.h"
-#include "ui/views/controls/webview/webview_export.h"
-
-// Defined in SkColor.h (32-bit ARGB color).
-using SkColor = unsigned int;
-
-namespace views {
-
-// Ensures that the background color of a given WebContents instance is always
-// set to a given color value.
-class WebContentsSetBackgroundColor
-    : public content::WebContentsObserver,
-      public content::WebContentsUserData<WebContentsSetBackgroundColor> {
- public:
-  WEBVIEW_EXPORT static void CreateForWebContentsWithColor(
-      content::WebContents* web_contents,
-      SkColor color);
-
-  ~WebContentsSetBackgroundColor() override;
-
- private:
-  WebContentsSetBackgroundColor(content::WebContents* web_contents,
-                                SkColor color);
-
-  // content::WebContentsObserver:
-  void RenderViewReady() override;
-  void RenderViewCreated(content::RenderViewHost* render_view_host) override;
-  void RenderViewHostChanged(content::RenderViewHost* old_host,
-                             content::RenderViewHost* new_host) override;
-
-  SkColor color_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebContentsSetBackgroundColor);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_CONTROLS_WEBVIEW_WEB_CONTENTS_SET_BACKGROUND_COLOR_H_