[MD Settings] PROOF OF CONCEPT - DO NOT LAND - URL rewrite

chrome/browser/extensions/extension_web_ui.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/extensions/extension_web_ui.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <vector>
@@ skipping 359 matching lines @@
   registry->RegisterDictionaryPref(kExtensionURLOverrides);
 }
 
 // static
 bool ExtensionWebUI::HandleChromeURLOverride(
     GURL* url,
     content::BrowserContext* browser_context) {
   if (!url->SchemeIs(content::kChromeUIScheme))
     return false;
 
+  if (!browser_context)
+    return false;
+
   Profile* profile = Profile::FromBrowserContext(browser_context);
   const base::DictionaryValue* overrides =
       profile->GetPrefs()->GetDictionary(kExtensionURLOverrides);
 
   std::string url_host = url->host();
   const base::ListValue* url_list = NULL;
   if (!overrides || !overrides->GetList(url_host, &url_list))
     return false;
 
   extensions::ExtensionRegistry* registry =
@@ skipping 43 matching lines @@
     *url = component_url;
     return true;
   }
 
   return false;
 }
 
 // static
 bool ExtensionWebUI::HandleChromeURLOverrideReverse(
     GURL* url, content::BrowserContext* browser_context) {
+  if (!browser_context)
+    return false;
+
   Profile* profile = Profile::FromBrowserContext(browser_context);
   const base::DictionaryValue* overrides =
       profile->GetPrefs()->GetDictionary(kExtensionURLOverrides);
   if (!overrides)
     return false;
 
   // Find the reverse mapping based on the given URL. For example this maps the
   // internal URL
   // chrome-extension://eemcgdkfndhakfknompkggombfjjjeno/main.html#1 to
   // chrome://bookmarks/#1 for display in the omnibox.
@@ skipping 105 matching lines @@
         extensions::ImageLoader::ImageRepresentation::ALWAYS_RESIZE,
         gfx::Size(pixel_size, pixel_size),
         resource_scale_factor));
   }
 
   // LoadImagesAsync actually can run callback synchronously. We want to force
   // async.
   extensions::ImageLoader::Get(profile)->LoadImagesAsync(
       extension, info_list, base::Bind(&RunFaviconCallbackAsync, callback));
 }