Add support to process favicons from Web Manifests

components/favicon/content/content_favicon_driver_unittest.cc

 // 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.
 
 #include "components/favicon/content/content_favicon_driver.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 112 matching lines @@
   std::vector<content::FaviconURL> favicon_urls;
   favicon_urls.push_back(
       content::FaviconURL(GURL("http://www.google.ca/favicon.ico"),
                           content::FaviconURL::FAVICON, kEmptyIconSizes));
   favicon::ContentFaviconDriver* driver =
       favicon::ContentFaviconDriver::FromWebContents(web_contents());
   static_cast<content::WebContentsObserver*>(driver)
       ->DidUpdateFaviconURL(favicon_urls);
 
   // Test that ContentFaviconDriver ignored the favicon url update.
-  EXPECT_TRUE(driver->favicon_urls().empty());
+  EXPECT_FALSE(driver->favicon_urls().has_value());
 }
 
 TEST_F(ContentFaviconDriverTest, RecordsHistorgramsForCandidates) {
   const std::vector<gfx::Size> kSizes16x16and32x32({{16, 16}, {32, 32}});
   base::HistogramTester tester;
   content::WebContentsObserver* driver_as_observer =
       ContentFaviconDriver::FromWebContents(web_contents());
 
   // Navigation to a page updating one icon.
   NavigateAndCommit(GURL("http://www.youtube.com"));
@@ skipping 28 matching lines @@
                           base::Bucket(/*min=*/3, /*count=*/2)));
   EXPECT_THAT(tester.GetAllSamples("Favicons.CandidatesWithDefinedSizesCount"),
               ElementsAre(base::Bucket(/*min=*/1, /*count=*/3)));
   EXPECT_THAT(tester.GetAllSamples("Favicons.CandidatesWithTouchIconsCount"),
               ElementsAre(base::Bucket(/*min=*/0, /*count=*/1),
                           base::Bucket(/*min=*/2, /*count=*/2)));
 }
 
 }  // namespace
 }  // namespace favicon