Remove ChromeBrowserProvider::GetFaviconForURL().

ios/chrome/browser/downstream_chromium_browser_provider.mm

Index: ios/chrome/browser/downstream_chromium_browser_provider.mm
diff --git a/ios/chrome/browser/downstream_chromium_browser_provider.mm b/ios/chrome/browser/downstream_chromium_browser_provider.mm
index 20a3056a603036934ddc6ff3343ff3e0f1c052fc..8e8d6502202e6a454557d50b7fd3cc3c0261ea2d 100644
--- a/ios/chrome/browser/downstream_chromium_browser_provider.mm
+++ b/ios/chrome/browser/downstream_chromium_browser_provider.mm
@@ -11,21 +11,11 @@
 
 #include "base/memory/ptr_util.h"
 #include "ios/chrome/browser/tabs/tab_model_synced_window_delegate_getter.h"
-#include "ios/chrome/browser/ui/webui/chrome_web_ui_ios_controller_factory.h"
 
 DownstreamChromiumBrowserProvider::DownstreamChromiumBrowserProvider() {}
 
 DownstreamChromiumBrowserProvider::~DownstreamChromiumBrowserProvider() {}
 
-void DownstreamChromiumBrowserProvider::GetFaviconForURL(
-    ios::ChromeBrowserState* browser_state,
-    const GURL& page_url,
-    const std::vector<int>& desired_sizes_in_pixel,
-    const favicon_base::FaviconResultsCallback& callback) const {
-  ChromeWebUIIOSControllerFactory::GetInstance()->GetFaviconForURL(
-      browser_state, page_url, desired_sizes_in_pixel, callback);
-}
-
 std::unique_ptr<sync_sessions::SyncedWindowDelegatesGetter>
 DownstreamChromiumBrowserProvider::CreateSyncedWindowDelegatesGetter(
     ios::ChromeBrowserState* browser_state) {