Add favicon integration tests for FaviconDriverImpl

chrome/browser/prerender/prerender_browsertest.cc

Index: chrome/browser/prerender/prerender_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_browsertest.cc b/chrome/browser/prerender/prerender_browsertest.cc
index 991e8f7fb53b14a7baaf2865dffd66fb69a5d875..ddb911b278dacb6faefaf861916ec37af0259bb1 100644
--- a/chrome/browser/prerender/prerender_browsertest.cc
+++ b/chrome/browser/prerender/prerender_browsertest.cc
@@ -2436,12 +2436,12 @@ IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PrerenderFavicon) {
 
   favicon::FaviconDriver* favicon_driver =
       favicon::ContentFaviconDriver::FromWebContents(GetActiveWebContents());
-  if (!favicon_driver->FaviconIsValid()) {
+  if (favicon_driver->GetFavicon().IsEmpty()) {
     // If the favicon has not been set yet, wait for it to be.
     FaviconUpdateWatcher favicon_update_watcher(GetActiveWebContents());
     favicon_update_watcher.Wait();
   }
-  EXPECT_TRUE(favicon_driver->FaviconIsValid());
+  EXPECT_FALSE(favicon_driver->GetFavicon().IsEmpty());
 }
 
 // Checks that when prerendered page is swapped in and the referring page