Making answer card to behave like other results.

ui/views/controls/webview/web_contents_set_background_color.h

 // 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 CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEB_CONTENTS_SET_BACKGROUND_COLOR_H_
-#define CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEB_CONTENTS_SET_BACKGROUND_COLOR_H_
+#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 chromeos {
+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:
-  static void CreateForWebContentsWithColor(content::WebContents* web_contents,
-                                            SkColor color);
+  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 chromeos
+}  // namespace views
 
-#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_WEB_CONTENTS_SET_BACKGROUND_COLOR_H_
+#endif  // UI_VIEWS_CONTROLS_WEBVIEW_WEB_CONTENTS_SET_BACKGROUND_COLOR_H_