Delete unused chrome://fallback-icon/ handling

chrome/browser/ui/webui/fallback_icon_source.h

-// Copyright 2015 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_UI_WEBUI_FALLBACK_ICON_SOURCE_H_
-#define CHROME_BROWSER_UI_WEBUI_FALLBACK_ICON_SOURCE_H_
-
-#include <memory>
-#include <string>
-
-#include "base/macros.h"
-#include "content/public/browser/url_data_source.h"
-
-class GURL;
-
-namespace favicon_base {
-struct FallbackIconStyle;
-}
-
-namespace favicon {
-class FallbackIconService;
-}
-
-// FallbackIconSource services explicit chrome:// requests for fallback icons.
-//
-// Format:
-//   chrome://fallback-icon/size,bc,tc,fsr,r/url
-// All of the parameters except for the url are optional. However, the order of
-// the parameters is not interchangeable, and all "," must be in place.
-//
-// Parameter:
-//  'size'
-//    Positive integer to specify the fallback icon's size in pixels.
-//  'bc'
-//    Fallback icon's background color, as named CSS color, or RGB / ARGB /
-//    RRGGBB / AARRGGBB hex formats (no leading "#").
-//  'tc'
-//    Fallback icon text color, as named CSS color, or RGB / ARGB / RRGGBB /
-//    AARRGGBB hex formats (no leading "#").
-//  'fsr'
-//    Number in [0.0, 1.0] to specify the fallback icon's font size (pixels)
-//    as a ratio to the icon's size.
-//  'r'
-//    Number in [0.0, 1.0] to specify the fallback icon's roundness.
-//    0.0 specifies a square icon; 1.0 specifies a circle icon; intermediate
-//    values specify a rounded square icon.
-//  'url'
-//    String to specify the page URL of the fallback icon.
-//
-//  Example: chrome://fallback-icon/32,red,#000,0.5,1.0/http://www.google.com/
-//    This requests a 32x32 fallback icon for http://www.google.com, using
-//    red as the background color, #000 as the text color, with font size of
-//    32 * 0.5 = 16, and the icon's background shape is a circle.
-class FallbackIconSource : public content::URLDataSource {
- public:
-  // |fallback_icon_service| is owned by caller, and may be null.
-  explicit FallbackIconSource(
-      favicon::FallbackIconService* fallback_icon_service);
-
-  ~FallbackIconSource() override;
-
-  // content::URLDataSource implementation.
-  std::string GetSource() const override;
-  void StartDataRequest(
-      const std::string& path,
-      const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
-      const content::URLDataSource::GotDataCallback& callback) override;
-  std::string GetMimeType(const std::string&) const override;
-  bool AllowCaching() const override;
-  bool ShouldReplaceExistingSource() const override;
-  bool ShouldServiceRequest(const GURL& url,
-                            content::ResourceContext* resource_context,
-                            int render_process_id) const override;
-
- private:
-  void SendFallbackIconHelper(
-      const GURL& url,
-      int size_in_pixels,
-      const favicon_base::FallbackIconStyle& style,
-      const content::URLDataSource::GotDataCallback& callback);
-
-  // Sends the default fallback icon.
-  void SendDefaultResponse(
-      const content::URLDataSource::GotDataCallback& callback);
-
-  favicon::FallbackIconService* fallback_icon_service_;
-
-  DISALLOW_COPY_AND_ASSIGN(FallbackIconSource);
-};
-
-#endif  // CHROME_BROWSER_UI_WEBUI_FALLBACK_ICON_SOURCE_H_