Use hi-resolution favicon variants if available.

chrome/browser/ui/views/ash/launcher/launcher_favicon_loader.cc

Index: chrome/browser/ui/views/ash/launcher/launcher_favicon_loader.cc
diff --git a/chrome/browser/ui/views/ash/launcher/launcher_favicon_loader.cc b/chrome/browser/ui/views/ash/launcher/launcher_favicon_loader.cc
index 33a08df67b54f38f6813e8be753650c4cbc6e8d4..71120de48a36574fd43182191377245800e69397 100644
--- a/chrome/browser/ui/views/ash/launcher/launcher_favicon_loader.cc
+++ b/chrome/browser/ui/views/ash/launcher/launcher_favicon_loader.cc
@@ -112,10 +112,13 @@ void FaviconBitmapHandler::DownloadFavicon(const GURL& image_url) {
   FaviconUtil::DownloadFavicon(host, image_url, image_size);
 }
 
-void FaviconBitmapHandler::OnDidDownloadFavicon(int id,
-                                                const GURL& image_url,
-                                                bool errored,
-                                                const SkBitmap& bitmap) {
+
+void FaviconBitmapHandler::OnDidDownloadFavicon(
+    int id,
+    const GURL& image_url,
+    bool errored,
+    int requested_size,
+    const std::vector<SkBitmap>& bitmaps) {
   UrlSet::iterator iter = pending_requests_.find(image_url);
   if (iter == pending_requests_.end()) {
     // Updates are received for all downloads; ignore unrequested urls.
@@ -123,8 +126,9 @@ void FaviconBitmapHandler::OnDidDownloadFavicon(int id,
   }
   pending_requests_.erase(iter);
 
-  if (!errored)
-    AddFavicon(image_url, bitmap);
+  // Favicon bitmaps are ordered by decreasing width.
+  if (!errored && !bitmaps.empty())
+    AddFavicon(image_url, bitmaps[0]);
 }
 
 void FaviconBitmapHandler::AddFavicon(const GURL& image_url,