[Fallback icons] Redoing http://crrev.com/988863002/, fixing use-after-free bug.

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 "base/memory/scoped_ptr.h"
 #include "components/favicon_base/fallback_icon_service.h"
 #include "content/public/browser/url_data_source.h"
 
 // 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 / #RRGGBB /
-//    #AARRGGBB hex formats.
+//    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 / #RRGGBB /
-//    #AARRGGBB hex formats.
+//    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.
 //
@@ skipping 22 matching lines @@
   // Sends the default fallback icon.
   void SendDefaultResponse(
       const content::URLDataSource::GotDataCallback& callback);
 
   scoped_ptr<favicon_base::FallbackIconService> fallback_icon_service_;
 
   DISALLOW_COPY_AND_ASSIGN(FallbackIconSource);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_FALLBACK_ICON_SOURCE_H_